Number
21,121
21,121 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 7
- Digital root
- 7
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,122
Primality
21,121 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 one hundred twenty-one
- Ordinal
- 21121st
- Binary
- 101001010000001
- Octal
- 51201
- Hexadecimal
- 5281
Also seen as
Unicode codepoint
劁
U+5281
Other letter (Lo)
UTF-8 encoding: E5 8A 81 (3 bytes).
Hex color
#005281
RGB(0, 82, 129)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.129.