21,379
21,379 is a prime, odd.
21,379 (twenty-one thousand three hundred seventy-nine) is an odd 5-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x5383.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 22
- Digit product
- 378
- Digital root
- 4
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 97,312
- Recamán's sequence
- a(41,081) = 21,379
- Square (n²)
- 457,061,641
- Cube (n³)
- 9,771,520,822,939
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,380
- φ(n) — Euler's totient
- 21,378
Primality
21,379 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√21,379 = [146; (4, 1, 1, 1, 3, 3, 1, 9, 3, 6, 1, 4, 3, 1, 2, 1, 15, 1, 1, 20, 2, 1, 2, 5, …)]
Representations
- In words
- twenty-one thousand three hundred seventy-nine
- Ordinal
- 21379th
- Binary
- 101001110000011
- Octal
- 51603
- Hexadecimal
- 0x5383
- Base64
- U4M=
- One's complement
- 44,156 (16-bit)
- Scientific notation
- 2.1379 × 10⁴
- As a duration
- 21,379 s = 5 hours, 56 minutes, 19 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵κατοθʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋨·𝋳
- Chinese
- 二萬一千三百七十九
- Chinese (financial)
- 貳萬壹仟參佰柒拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,379 = 0
- e — Euler's number (e)
- Digit 21,379 = 6
- φ — Golden ratio (φ)
- Digit 21,379 = 3
- √2 — Pythagoras's (√2)
- Digit 21,379 = 9
- ln 2 — Natural log of 2
- Digit 21,379 = 2
- γ — Euler-Mascheroni (γ)
- Digit 21,379 = 3
Also seen as
UTF-8 encoding: E5 8E 83 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.83.131.
- Address
- 0.0.83.131
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.83.131
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21379 first appears in π at position 27,858 of the decimal expansion (the 27,858ordinal-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.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.