21,242
21,242 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 11
- Digit product
- 32
- Digital root
- 2
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 24,212
- Recamán's sequence
- a(41,355) = 21,242
- Square (n²)
- 451,222,564
- Cube (n³)
- 9,584,869,704,488
- Divisor count
- 16
- σ(n) — sum of divisors
- 36,960
- φ(n) — Euler's totient
- 9,072
- Sum of prime factors
- 77
Primality
Prime factorization: 2 × 13 × 19 × 43
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand two hundred forty-two
- Ordinal
- 21242nd
- Binary
- 101001011111010
- Octal
- 51372
- Hexadecimal
- 0x52FA
- Base64
- Uvo=
- One's complement
- 44,293 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵κασμβʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋢·𝋢
- Chinese
- 二萬一千二百四十二
- Chinese (financial)
- 貳萬壹仟貳佰肆拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,242 = 1
- e — Euler's number (e)
- Digit 21,242 = 3
- φ — Golden ratio (φ)
- Digit 21,242 = 7
- √2 — Pythagoras's (√2)
- Digit 21,242 = 6
- ln 2 — Natural log of 2
- Digit 21,242 = 9
- γ — Euler-Mascheroni (γ)
- Digit 21,242 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21242, here are decompositions:
- 31 + 21211 = 21242
- 73 + 21169 = 21242
- 79 + 21163 = 21242
- 103 + 21139 = 21242
- 181 + 21061 = 21242
- 211 + 21031 = 21242
- 223 + 21019 = 21242
- 229 + 21013 = 21242
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8B BA (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.250.
- Address
- 0.0.82.250
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.250
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21242 first appears in π at position 9,480 of the decimal expansion (the 9,480ordinal-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.