21,442
21,442 is a composite number, even.
21,442 (twenty-one thousand four hundred forty-two) is an even 5-digit number. It is a composite number with 8 divisors, and factors as 2 × 71 × 151. Written other ways, in hexadecimal, 0x53C2.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 13
- Digit product
- 64
- Digital root
- 4
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 24,412
- Recamán's sequence
- a(40,955) = 21,442
- Square (n²)
- 459,759,364
- Cube (n³)
- 9,858,160,282,888
- Divisor count
- 8
- σ(n) — sum of divisors
- 32,832
- φ(n) — Euler's totient
- 10,500
- Sum of prime factors
- 224
Primality
Prime factorization: 2 × 71 × 151
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√21,442 = [146; (2, 3, 8, 1, 1, 2, 3, 5, 1, 2, 6, 1, 3, 1, 3, 1, 1, 1, 4, 146, 4, 1, 1, 1, …)]
Period length 40 — the block in parentheses repeats forever.
Representations
- In words
- twenty-one thousand four hundred forty-two
- Ordinal
- 21442nd
- Binary
- 101001111000010
- Octal
- 51702
- Hexadecimal
- 0x53C2
- Base64
- U8I=
- One's complement
- 44,093 (16-bit)
- Scientific notation
- 2.1442 × 10⁴
- As a duration
- 21,442 s = 5 hours, 57 minutes, 22 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵καυμβʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋬·𝋢
- Chinese
- 二萬一千四百四十二
- Chinese (financial)
- 貳萬壹仟肆佰肆拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,442 = 6
- e — Euler's number (e)
- Digit 21,442 = 1
- φ — Golden ratio (φ)
- Digit 21,442 = 6
- √2 — Pythagoras's (√2)
- Digit 21,442 = 3
- ln 2 — Natural log of 2
- Digit 21,442 = 8
- γ — Euler-Mascheroni (γ)
- Digit 21,442 = 1
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21442, here are decompositions:
- 23 + 21419 = 21442
- 41 + 21401 = 21442
- 59 + 21383 = 21442
- 101 + 21341 = 21442
- 173 + 21269 = 21442
- 251 + 21191 = 21442
- 263 + 21179 = 21442
- 293 + 21149 = 21442
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8F 82 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.83.194.
- Address
- 0.0.83.194
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.83.194
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21442 first appears in π at position 65,510 of the decimal expansion (the 65,510ordinal-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
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.