21,042
21,042 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
- 24,012
- Recamán's sequence
- a(41,755) = 21,042
- Square (n²)
- 442,765,764
- Cube (n³)
- 9,316,677,206,088
- Divisor count
- 24
- σ(n) — sum of divisors
- 52,416
- φ(n) — Euler's totient
- 5,976
- Sum of prime factors
- 182
Primality
Prime factorization: 2 × 3 2 × 7 × 167
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand forty-two
- Ordinal
- 21042nd
- Binary
- 101001000110010
- Octal
- 51062
- Hexadecimal
- 0x5232
- Base64
- UjI=
- One's complement
- 44,493 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒌋𒌋𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵καμβʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋬·𝋢
- Chinese
- 二萬一千零四十二
- Chinese (financial)
- 貳萬壹仟零肆拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,042 = 7
- e — Euler's number (e)
- Digit 21,042 = 6
- φ — Golden ratio (φ)
- Digit 21,042 = 8
- √2 — Pythagoras's (√2)
- Digit 21,042 = 5
- ln 2 — Natural log of 2
- Digit 21,042 = 5
- γ — Euler-Mascheroni (γ)
- Digit 21,042 = 1
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21042, here are decompositions:
- 11 + 21031 = 21042
- 19 + 21023 = 21042
- 23 + 21019 = 21042
- 29 + 21013 = 21042
- 31 + 21011 = 21042
- 41 + 21001 = 21042
- 59 + 20983 = 21042
- 61 + 20981 = 21042
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 88 B2 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.50.
- Address
- 0.0.82.50
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.50
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21042 first appears in π at position 127,702 of the decimal expansion (the 127,702ordinal-suffix:nd 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.