21,444
21,444 is a composite number, even.
21,444 (twenty-one thousand four hundred forty-four) is an even 5-digit number. It is a composite number with 12 divisors, and factors as 2² × 3 × 1,787. Its proper divisors sum to 28,620, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x53C4.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 15
- Digit product
- 128
- Digital root
- 6
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 44,412
- Recamán's sequence
- a(40,951) = 21,444
- Square (n²)
- 459,845,136
- Cube (n³)
- 9,860,919,096,384
- Divisor count
- 12
- σ(n) — sum of divisors
- 50,064
- φ(n) — Euler's totient
- 7,144
- Sum of prime factors
- 1,794
Primality
Prime factorization: 2 2 × 3 × 1787
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√21,444 = [146; (2, 3, 1, 1, 18, 1, 25, 1, 2, 11, 2, 1, 1, 1, 5, 1, 1, 1, 1, 7, 3, 4, 3, 1, …)]
Representations
- In words
- twenty-one thousand four hundred forty-four
- Ordinal
- 21444th
- Binary
- 101001111000100
- Octal
- 51704
- Hexadecimal
- 0x53C4
- Base64
- U8Q=
- One's complement
- 44,091 (16-bit)
- Scientific notation
- 2.1444 × 10⁴
- As a duration
- 21,444 s = 5 hours, 57 minutes, 24 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καυμδʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋬·𝋤
- Chinese
- 二萬一千四百四十四
- Chinese (financial)
- 貳萬壹仟肆佰肆拾肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,444 = 7
- e — Euler's number (e)
- Digit 21,444 = 8
- φ — Golden ratio (φ)
- Digit 21,444 = 5
- √2 — Pythagoras's (√2)
- Digit 21,444 = 1
- ln 2 — Natural log of 2
- Digit 21,444 = 6
- γ — Euler-Mascheroni (γ)
- Digit 21,444 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21444, here are decompositions:
- 11 + 21433 = 21444
- 37 + 21407 = 21444
- 43 + 21401 = 21444
- 47 + 21397 = 21444
- 53 + 21391 = 21444
- 61 + 21383 = 21444
- 67 + 21377 = 21444
- 97 + 21347 = 21444
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8F 84 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.83.196.
- Address
- 0.0.83.196
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.83.196
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21444 first appears in π at position 34,585 of the decimal expansion (the 34,585ordinal-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°.