Number

19,421

19,421 is a prime, odd.

Arithmetic Number Chen Prime Cousin Prime Deficient Number Emirp Evil Number Happy Number Prime Pythagorean Prime Recamán's Sequence Self Number Sexy Prime Squarefree Twin Prime

Properties

Parity: Odd
Digit count: 5
Digit sum: 17
Digit product: 72
Digital root: 8
Palindrome: No
Bit width: 15 bits
Reversed: 12,491
Recamán's sequence: a(87,406) = 19,421
Square (n²): 377,175,241
Cube (n³): 7,325,120,355,461
Divisor count: 2
σ(n) — sum of divisors: 19,422
φ(n) — Euler's totient: 19,420

Primality

19,421 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 19421

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 19,421)

1 × 19421

First multiples

19,421 · 38,842 (double) · 58,263 · 77,684 · 97,105 · 116,526 · 135,947 · 155,368 · 174,789 · 194,210

Sums & aliquot sequence

As a sum of two squares: 10² + 139²

As consecutive integers: 9,710 + 9,711

Representations

In words: nineteen thousand four hundred twenty-one
Ordinal: 19421st
Binary: 100101111011101
Octal: 45735
Hexadecimal: 0x4BDD
Base64: S90=
One's complement: 46,114 (16-bit)

In other bases

ternary (3) 222122022

quaternary (4) 10233131

quinary (5) 1110141

senary (6) 225525

septenary (7) 110423

nonary (9) 28568

undecimal (11) 13656

duodecimal (12) b2a5

tridecimal (13) 8abc

tetradecimal (14) 7113

pentadecimal (15) 5b4b

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺
Greek (Milesian): ͵ιθυκαʹ
Mayan (base 20): 𝋢·𝋨·𝋫·𝋡
Chinese: 一萬九千四百二十一
Chinese (financial): 壹萬玖仟肆佰貳拾壹

In other modern scripts

Eastern Arabic ١٩٤٢١ Devanagari १९४२१ Bengali ১৯৪২১ Tamil ௧௯௪௨௧ Thai ๑๙๔๒๑ Tibetan ༡༩༤༢༡ Khmer ១៩៤២១ Lao ໑໙໔໒໑ Burmese ၁၉၄၂၁

Digit at this position in famous constants

π — Pi (π): Digit 19,421 = 7
e — Euler's number (e): Digit 19,421 = 6
φ — Golden ratio (φ): Digit 19,421 = 6
√2 — Pythagoras's (√2): Digit 19,421 = 8
ln 2 — Natural log of 2: Digit 19,421 = 0
γ — Euler-Mascheroni (γ): Digit 19,421 = 4

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 19,417 (gap of 4)
Next prime: 19,423 (gap of 2)

Pair status: twin with 19423, cousin with 19417.

Unicode codepoint

䯝

CJK Unified Ideograph-4Bdd

U+4BDD

Other letter (Lo)

UTF-8 encoding: E4 AF 9D (3 bytes).

Lookup U+4BDD on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#004BDD

RGB(0, 75, 221)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.75.221.

Address: 0.0.75.221
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.75.221

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

Position in π

The digit sequence 19421 first appears in π at position 188,168 of the decimal expansion (the 188,168ordinal-suffix:th digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 19421 on Pi Search ↗