21,066
21,066 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 15
- Digit product
- 0
- Digital root
- 6
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 66,012
- Recamán's sequence
- a(41,707) = 21,066
- Square (n²)
- 443,776,356
- Cube (n³)
- 9,348,592,715,496
- Divisor count
- 8
- σ(n) — sum of divisors
- 42,144
- φ(n) — Euler's totient
- 7,020
- Sum of prime factors
- 3,516
Primality
Prime factorization: 2 × 3 × 3511
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand sixty-six
- Ordinal
- 21066th
- Binary
- 101001001001010
- Octal
- 51112
- Hexadecimal
- 0x524A
- Base64
- Uko=
- One's complement
- 44,469 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹 𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καξϛʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋭·𝋦
- Chinese
- 二萬一千零六十六
- Chinese (financial)
- 貳萬壹仟零陸拾陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,066 = 0
- e — Euler's number (e)
- Digit 21,066 = 6
- φ — Golden ratio (φ)
- Digit 21,066 = 7
- √2 — Pythagoras's (√2)
- Digit 21,066 = 3
- ln 2 — Natural log of 2
- Digit 21,066 = 5
- γ — Euler-Mascheroni (γ)
- Digit 21,066 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21066, here are decompositions:
- 5 + 21061 = 21066
- 7 + 21059 = 21066
- 43 + 21023 = 21066
- 47 + 21019 = 21066
- 53 + 21013 = 21066
- 83 + 20983 = 21066
- 103 + 20963 = 21066
- 107 + 20959 = 21066
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 89 8A (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.74.
- Address
- 0.0.82.74
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.74
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21066 first appears in π at position 1,891 of the decimal expansion (the 1,891ordinal-suffix:st 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.