Number

212

212 is a composite number, even, a calendar year.

Arithmetic Number Consecutive Digits Deficient Number Evil Number Palindrome Recamán's Sequence Year Zuckerman Number

Historical context — 212 AD

Calendar year

Year 212 (CCXII) was a leap year starting on Wednesday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Historical context — 212 BC

Calendar year

Year 212 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Year facts

Year type: Leap year
Divisible by 4 and not by 100; February has 29 days.
Days in year: 366
ISO weeks: 53
Long year: contains 53 ISO weeks.
Started on: Wednesday
January 1, 212
Ended on: Thursday
December 31, 212
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 210s
210–219
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,814
1814 years before 2026.

In other calendars

Hebrew: 3972 / 3973 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Dragon
Sexagenary cycle position 29 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 755 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 204 / 205 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 134 / 133 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 5
Digit product: 4
Digital root: 5
Palindrome: Yes
Bit width: 8 bits
Recamán's sequence: a(2,608) = 212
Square (n²): 44,944
Cube (n³): 9,528,128
Divisor count: 6
σ(n) — sum of divisors: 378
φ(n) — Euler's totient: 104
Sum of prime factors: 57

Primality

Prime factorization: 2 ² × 53

Nearest primes: 211 (−1) · 223 (+11)

Divisors & multiples

All divisors (6)

1 · 2 · 4 · 53 · 106 (half) · 212

Aliquot sum (sum of proper divisors): 166

Factor pairs (a × b = 212)

1 × 212

2 × 106

4 × 53

First multiples

212 · 424 (double) · 636 · 848 · 1,060 · 1,272 · 1,484 · 1,696 · 1,908 · 2,120

Sums & aliquot sequence

As a sum of two squares: 4² + 14²

As consecutive integers: 23 + 24 + … + 30

Aliquot sequence: 212 → 166 → 86 → 46 → 26 → 16 → 15 → 9 → 4 → 3 → 1 → 0 — terminates at zero

Representations

In words: two hundred twelve
Ordinal: 212th
Roman numeral: CCXII
Binary: 11010100
Octal: 324
Hexadecimal: 0xD4
Base64: 1A==
One's complement: 43 (8-bit)

In other bases

ternary (3) 21212

quaternary (4) 3110

quinary (5) 1322

senary (6) 552

septenary (7) 422

nonary (9) 255

undecimal (11) 183

duodecimal (12) 158

tridecimal (13) 134

tetradecimal (14) 112

pentadecimal (15) e2

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓎆𓏺𓏺
Greek (Milesian): σιβʹ
Mayan (base 20): 𝋪·𝋬
Chinese: 二百一十二
Chinese (financial): 貳佰壹拾貳

In other modern scripts

Eastern Arabic ٢١٢ Devanagari २१२ Bengali ২১২ Tamil ௨௧௨ Thai ๒๑๒ Tibetan ༢༡༢ Khmer ២១២ Lao ໒໑໒ Burmese ၂၁၂

Digit at this position in famous constants

π — Pi (π): Digit 212 = 6
e — Euler's number (e): Digit 212 = 9
φ — Golden ratio (φ): Digit 212 = 8
√2 — Pythagoras's (√2): Digit 212 = 6
ln 2 — Natural log of 2: Digit 212 = 9
γ — Euler-Mascheroni (γ): Digit 212 = 9

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 212, here are decompositions:

13 + 199 = 212
19 + 193 = 212
31 + 181 = 212
61 + 151 = 212
73 + 139 = 212
103 + 109 = 212

Unicode codepoint

Latin Capital Letter O With Circumflex

U+00D4

Uppercase letter (Lu)

UTF-8 encoding: C3 94 (2 bytes).

Lookup U+00D4 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000D4

RGB(0, 0, 212)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.212.

Address: 0.0.0.212
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.212

Unspecified address (0.0.0.0/8) — "this network" placeholder.

NANP area code 212

The number 212 is an active NANP area code (North American Numbering Plan).

Primary area: Manhattan
Region: New York
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 212 ↗