16,421
16,421 is a prime, odd.
16,421 (sixteen thousand four hundred twenty-one) is an odd 5-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x4025.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 14
- Digit product
- 48
- Digital root
- 5
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 12,461
- Recamán's sequence
- a(17,870) = 16,421
- Square (n²)
- 269,649,241
- Cube (n³)
- 4,427,910,186,461
- Divisor count
- 2
- σ(n) — sum of divisors
- 16,422
- φ(n) — Euler's totient
- 16,420
Primality
16,421 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√16,421 = [128; (6, 1, 11, 1, 22, 2, 1, 1, 1, 8, 4, 1, 2, 1, 1, 3, 5, 5, 1, 3, 2, 1, 3, 13, …)]
Representations
- In words
- sixteen thousand four hundred twenty-one
- Ordinal
- 16421st
- Binary
- 100000000100101
- Octal
- 40045
- Hexadecimal
- 0x4025
- Base64
- QCU=
- One's complement
- 49,114 (16-bit)
- Scientific notation
- 1.6421 × 10⁴
- As a duration
- 16,421 s = 4 hours, 33 minutes, 41 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ιϛυκαʹ
- Mayan (base 20)
- 𝋢·𝋡·𝋡·𝋡
- Chinese
- 一萬六千四百二十一
- Chinese (financial)
- 壹萬陸仟肆佰貳拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 16,421 = 6
- e — Euler's number (e)
- Digit 16,421 = 2
- φ — Golden ratio (φ)
- Digit 16,421 = 0
- √2 — Pythagoras's (√2)
- Digit 16,421 = 4
- ln 2 — Natural log of 2
- Digit 16,421 = 1
- γ — Euler-Mascheroni (γ)
- Digit 16,421 = 2
Also seen as
UTF-8 encoding: E4 80 A5 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.64.37.
- Address
- 0.0.64.37
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.64.37
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 16,421 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C10 (16744 Hz, -34¢)
- Scientific pitch (C4 = 256 Hz): C10 (16384 Hz, +4¢)
- Baroque pitch (A4 = 415 Hz): C♯10 (16731.8 Hz, -32¢)
The digit sequence 16421 first appears in π at position 7,602 of the decimal expansion (the 7,602ordinal-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.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.