21,143
21,143 is a prime, odd.
21,143 (twenty-one thousand one hundred forty-three) is an odd 5-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x5297.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 11
- Digit product
- 24
- Digital root
- 2
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 34,112
- Recamán's sequence
- a(41,553) = 21,143
- Square (n²)
- 447,026,449
- Cube (n³)
- 9,451,480,211,207
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,144
- φ(n) — Euler's totient
- 21,142
Primality
21,143 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√21,143 = [145; (2, 2, 5, 1, 11, 1, 4, 145, 4, 1, 11, 1, 5, 2, 2, 290)]
Period length 16 — the block in parentheses repeats forever.
Representations
- In words
- twenty-one thousand one hundred forty-three
- Ordinal
- 21143rd
- Binary
- 101001010010111
- Octal
- 51227
- Hexadecimal
- 0x5297
- Base64
- Upc=
- One's complement
- 44,392 (16-bit)
- Scientific notation
- 2.1143 × 10⁴
- As a duration
- 21,143 s = 5 hours, 52 minutes, 23 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵καρμγʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋱·𝋣
- Chinese
- 二萬一千一百四十三
- Chinese (financial)
- 貳萬壹仟壹佰肆拾參
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,143 = 7
- e — Euler's number (e)
- Digit 21,143 = 0
- φ — Golden ratio (φ)
- Digit 21,143 = 9
- √2 — Pythagoras's (√2)
- Digit 21,143 = 6
- ln 2 — Natural log of 2
- Digit 21,143 = 0
- γ — Euler-Mascheroni (γ)
- Digit 21,143 = 8
Also seen as
UTF-8 encoding: E5 8A 97 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.151.
- Address
- 0.0.82.151
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.151
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21143 first appears in π at position 62,417 of the decimal expansion (the 62,417ordinal-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.
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.