21,204
21,204 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 9
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 40,212
- Recamán's sequence
- a(41,431) = 21,204
- Square (n²)
- 449,609,616
- Cube (n³)
- 9,533,522,297,664
- Divisor count
- 36
- σ(n) — sum of divisors
- 58,240
- φ(n) — Euler's totient
- 6,480
- Sum of prime factors
- 60
Primality
Prime factorization: 2 2 × 3 2 × 19 × 31
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand two hundred four
- Ordinal
- 21204th
- Binary
- 101001011010100
- Octal
- 51324
- Hexadecimal
- 0x52D4
- Base64
- UtQ=
- One's complement
- 44,331 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵κασδʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋠·𝋤
- Chinese
- 二萬一千二百零四
- Chinese (financial)
- 貳萬壹仟貳佰零肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,204 = 9
- e — Euler's number (e)
- Digit 21,204 = 0
- φ — Golden ratio (φ)
- Digit 21,204 = 2
- √2 — Pythagoras's (√2)
- Digit 21,204 = 5
- ln 2 — Natural log of 2
- Digit 21,204 = 3
- γ — Euler-Mascheroni (γ)
- Digit 21,204 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21204, here are decompositions:
- 11 + 21193 = 21204
- 13 + 21191 = 21204
- 17 + 21187 = 21204
- 41 + 21163 = 21204
- 47 + 21157 = 21204
- 61 + 21143 = 21204
- 83 + 21121 = 21204
- 97 + 21107 = 21204
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8B 94 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.212.
- Address
- 0.0.82.212
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.212
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21204 first appears in π at position 150,853 of the decimal expansion (the 150,853ordinal-suffix:rd 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.