Number

211

211 is a prime, odd, a calendar year.

Arithmetic Number Balanced Prime Chen Prime Deficient Number Odious Number Pernicious Number Prime Recamán's Sequence Self Number Squarefree Year

Historical context — 211 AD

Calendar year

Year 211 (CCXI) was a common year starting on Tuesday of the Julian calendar.

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Historical context — 211 BC

Calendar year

Year 211 BC was a year of the pre-Julian Roman calendar.

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Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Tuesday
January 1, 211
Ended on: Tuesday
December 31, 211
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: 1,815
1815 years before 2026.

In other calendars

Hebrew: 3971 / 3972 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Rabbit
Sexagenary cycle position 28 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 754 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 203 / 204 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 133 / 132 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 4
Digit product: 2
Digital root: 4
Palindrome: No
Bit width: 8 bits
Reversed: 112
Recamán's sequence: a(2,610) = 211
Square (n²): 44,521
Cube (n³): 9,393,931
Divisor count: 2
σ(n) — sum of divisors: 212
φ(n) — Euler's totient: 210

Primality

211 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 211

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 211)

1 × 211

First multiples

211 · 422 (double) · 633 · 844 · 1,055 · 1,266 · 1,477 · 1,688 · 1,899 · 2,110

Sums & aliquot sequence

As consecutive integers: 105 + 106

Representations

In words: two hundred eleven
Ordinal: 211th
Roman numeral: CCXI
Binary: 11010011
Octal: 323
Hexadecimal: 0xD3
Base64: 0w==
One's complement: 44 (8-bit)

In other bases

ternary (3) 21211

quaternary (4) 3103

quinary (5) 1321

senary (6) 551

septenary (7) 421

nonary (9) 254

undecimal (11) 182

duodecimal (12) 157

tridecimal (13) 133

tetradecimal (14) 111

pentadecimal (15) e1

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓍢𓍢𓎆𓏺
Greek (Milesian): σιαʹ
Mayan (base 20): 𝋪·𝋫
Chinese: 二百一十一
Chinese (financial): 貳佰壹拾壹

In other modern scripts

Eastern Arabic ٢١١ Devanagari २११ Bengali ২১১ Tamil ௨௧௧ Thai ๒๑๑ Tibetan ༢༡༡ Khmer ២១១ Lao ໒໑໑ Burmese ၂၁၁

Digit at this position in famous constants

π — Pi (π): Digit 211 = 5
e — Euler's number (e): Digit 211 = 7
φ — Golden ratio (φ): Digit 211 = 6
√2 — Pythagoras's (√2): Digit 211 = 1
ln 2 — Natural log of 2: Digit 211 = 7
γ — Euler-Mascheroni (γ): Digit 211 = 3

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 199 (gap of 12)
Next prime: 223 (gap of 12)

Unicode codepoint

Latin Capital Letter O With Acute

U+00D3

Uppercase letter (Lu)

UTF-8 encoding: C3 93 (2 bytes).

Lookup U+00D3 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000D3

RGB(0, 0, 211)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.211.

Address: 0.0.0.211
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.211

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