21,089
21,089 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 20
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 98,012
- Recamán's sequence
- a(41,661) = 21,089
- Square (n²)
- 444,745,921
- Cube (n³)
- 9,379,246,727,969
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,090
- φ(n) — Euler's totient
- 21,088
Primality
21,089 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand eighty-nine
- Ordinal
- 21089th
- Binary
- 101001001100001
- Octal
- 51141
- Hexadecimal
- 0x5261
- Base64
- UmE=
- One's complement
- 44,446 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καπθʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋮·𝋩
- Chinese
- 二萬一千零八十九
- Chinese (financial)
- 貳萬壹仟零捌拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,089 = 6
- e — Euler's number (e)
- Digit 21,089 = 9
- φ — Golden ratio (φ)
- Digit 21,089 = 0
- √2 — Pythagoras's (√2)
- Digit 21,089 = 2
- ln 2 — Natural log of 2
- Digit 21,089 = 6
- γ — Euler-Mascheroni (γ)
- Digit 21,089 = 0
Also seen as
UTF-8 encoding: E5 89 A1 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.97.
- Address
- 0.0.82.97
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.97
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.
The digit sequence 21089 first appears in π at position 92,825 of the decimal expansion (the 92,825ordinal-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.