number.wiki
Number

21,017

21,017 is a prime, odd.

Cousin Prime Deficient Number Prime Sexy Prime Squarefree Twin Prime

Properties

Parity
Odd
Digit count
5
Digit sum
11
Digital root
2
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
21,018

Primality

21,017 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 21017
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 21,017)
1 × 21017
First multiples
21,017 · 42,034 · 63,051 · 84,068 · 105,085 · 126,102 · 147,119 · 168,136 · 189,153 · 210,170

Representations

In words
twenty-one thousand seventeen
Ordinal
21017th
Binary
101001000011001
Octal
51031
Hexadecimal
5219

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 21,013 (gap of 4)
  • Next prime: 21,019 (gap of 2)

Pair status: twin with 21019, cousin with 21013.

Unicode codepoint
U+5219
Other letter (Lo)

UTF-8 encoding: E5 88 99 (3 bytes).

Hex color
#005219
RGB(0, 82, 25)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.25.