12,921
12,921 is a composite number, odd.
12,921 (twelve thousand nine hundred twenty-one) is an odd 5-digit number. It is a composite number with 8 divisors, and factors as 3 × 59 × 73. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in hexadecimal, 0x3279.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 15
- Digit product
- 36
- Digital root
- 6
- Palindrome
- Yes
- Bit width
- 14 bits
- Recamán's sequence
- a(48,433) = 12,921
- Square (n²)
- 166,952,241
- Cube (n³)
- 2,157,189,905,961
- Divisor count
- 8
- σ(n) — sum of divisors
- 17,760
- φ(n) — Euler's totient
- 8,352
- Sum of prime factors
- 135
Primality
Prime factorization: 3 × 59 × 73
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√12,921 = [113; (1, 2, 28, 11, 1, 13, 3, 2, 2, 1, 6, 2, 1, 1, 9, 3, 2, 4, 3, 3, 1, 2, 9, 8, …)]
Period length 52 — the block in parentheses repeats forever.
Representations
- In words
- twelve thousand nine hundred twenty-one
- Ordinal
- 12921st
- Binary
- 11001001111001
- Octal
- 31171
- Hexadecimal
- 0x3279
- Base64
- Mnk=
- One's complement
- 52,614 (16-bit)
- Scientific notation
- 1.2921 × 10⁴
- As a duration
- 12,921 s = 3 hours, 35 minutes, 21 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ιβϡκαʹ
- Mayan (base 20)
- 𝋡·𝋬·𝋦·𝋡
- Chinese
- 一萬二千九百二十一
- Chinese (financial)
- 壹萬貳仟玖佰貳拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 12,921 = 2
- e — Euler's number (e)
- Digit 12,921 = 2
- φ — Golden ratio (φ)
- Digit 12,921 = 9
- √2 — Pythagoras's (√2)
- Digit 12,921 = 0
- ln 2 — Natural log of 2
- Digit 12,921 = 1
- γ — Euler-Mascheroni (γ)
- Digit 12,921 = 7
Also seen as
UTF-8 encoding: E3 89 B9 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.50.121.
- Address
- 0.0.50.121
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.50.121
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 12,921 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯9 (13289.8 Hz, -49¢ — about midway to G9)
- Scientific pitch (C4 = 256 Hz): G♯9 (13004 Hz, -11¢)
- Baroque pitch (A4 = 415 Hz): A9 (13280 Hz, -47¢ — about midway to G♯9)
The digit sequence 12921 first appears in π at position 178,847 of the decimal expansion (the 178,847ordinal-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.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.