12,421
12,421 is a prime, odd.
12,421 (twelve thousand four hundred twenty-one) is an odd 5-digit number. It is a prime number — divisible only by 1 and itself. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in hexadecimal, 0x3085.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 10
- Digit product
- 16
- Digital root
- 1
- Palindrome
- Yes
- Bit width
- 14 bits
- Recamán's sequence
- a(21,942) = 12,421
- Square (n²)
- 154,281,241
- Cube (n³)
- 1,916,327,294,461
- Divisor count
- 2
- σ(n) — sum of divisors
- 12,422
- φ(n) — Euler's totient
- 12,420
Primality
12,421 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√12,421 = [111; (2, 4, 2, 4, 1, 73, 2, 14, 2, 1, 3, 24, 2, 44, 11, 8, 6, 14, 1, 2, 3, 2, 1, 2, …)]
Representations
- In words
- twelve thousand four hundred twenty-one
- Ordinal
- 12421st
- Binary
- 11000010000101
- Octal
- 30205
- Hexadecimal
- 0x3085
- Base64
- MIU=
- One's complement
- 53,114 (16-bit)
- Scientific notation
- 1.2421 × 10⁴
- As a duration
- 12,421 s = 3 hours, 27 minutes, 1 second
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ιβυκαʹ
- Mayan (base 20)
- 𝋡·𝋫·𝋡·𝋡
- Chinese
- 一萬二千四百二十一
- Chinese (financial)
- 壹萬貳仟肆佰貳拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 12,421 = 3
- e — Euler's number (e)
- Digit 12,421 = 7
- φ — Golden ratio (φ)
- Digit 12,421 = 0
- √2 — Pythagoras's (√2)
- Digit 12,421 = 6
- ln 2 — Natural log of 2
- Digit 12,421 = 3
- γ — Euler-Mascheroni (γ)
- Digit 12,421 = 5
Also seen as
UTF-8 encoding: E3 82 85 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.48.133.
- Address
- 0.0.48.133
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.48.133
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 12,421 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G9 (12543.9 Hz, -17¢)
- Scientific pitch (C4 = 256 Hz): G9 (12274.1 Hz, +21¢)
- Baroque pitch (A4 = 415 Hz): G♯9 (12534.7 Hz, -16¢)
The digit sequence 12421 first appears in π at position 58,726 of the decimal expansion (the 58,726ordinal-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
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.