Number
21,011
21,011 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 5
- Digital root
- 5
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,012
Primality
21,011 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
Representations
- In words
- twenty-one thousand eleven
- Ordinal
- 21011th
- Binary
- 101001000010011
- Octal
- 51023
- Hexadecimal
- 5213
Also seen as
Prime neighborhood
Unicode codepoint
刓
U+5213
Other letter (Lo)
UTF-8 encoding: E5 88 93 (3 bytes).
Hex color
#005213
RGB(0, 82, 19)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.19.