21,124
21,124 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 10
- Digit product
- 16
- Digital root
- 1
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 42,112
- Recamán's sequence
- a(41,591) = 21,124
- Square (n²)
- 446,223,376
- Cube (n³)
- 9,426,022,594,624
- Divisor count
- 6
- σ(n) — sum of divisors
- 36,974
- φ(n) — Euler's totient
- 10,560
- Sum of prime factors
- 5,285
Primality
Prime factorization: 2 2 × 5281
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand one hundred twenty-four
- Ordinal
- 21124th
- Binary
- 101001010000100
- Octal
- 51204
- Hexadecimal
- 0x5284
- Base64
- UoQ=
- One's complement
- 44,411 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹 𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓎆𓎆𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καρκδʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋰·𝋤
- Chinese
- 二萬一千一百二十四
- Chinese (financial)
- 貳萬壹仟壹佰貳拾肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,124 = 1
- e — Euler's number (e)
- Digit 21,124 = 9
- φ — Golden ratio (φ)
- Digit 21,124 = 7
- √2 — Pythagoras's (√2)
- Digit 21,124 = 3
- ln 2 — Natural log of 2
- Digit 21,124 = 7
- γ — Euler-Mascheroni (γ)
- Digit 21,124 = 1
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21124, here are decompositions:
- 3 + 21121 = 21124
- 17 + 21107 = 21124
- 23 + 21101 = 21124
- 101 + 21023 = 21124
- 107 + 21017 = 21124
- 113 + 21011 = 21124
- 227 + 20897 = 21124
- 251 + 20873 = 21124
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8A 84 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.132.
- Address
- 0.0.82.132
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.132
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21124 first appears in π at position 51,713 of the decimal expansion (the 51,713ordinal-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.