number.wiki
Number

21,023

21,023 is a prime, odd.

Cousin Prime Deficient Number Prime Sexy Prime Squarefree

Properties

Parity
Odd
Digit count
5
Digit sum
8
Digital root
8
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
21,024

Primality

21,023 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 21023
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 21,023)
1 × 21023
First multiples
21,023 · 42,046 · 63,069 · 84,092 · 105,115 · 126,138 · 147,161 · 168,184 · 189,207 · 210,230

Representations

In words
twenty-one thousand twenty-three
Ordinal
21023rd
Binary
101001000011111
Octal
51037
Hexadecimal
521F

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 21,019 (gap of 4)
  • Next prime: 21,031 (gap of 8)

Pair status: cousin with 21019.

Unicode codepoint
U+521F
Other letter (Lo)

UTF-8 encoding: E5 88 9F (3 bytes).

Hex color
#00521F
RGB(0, 82, 31)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.31.