Number
421
421 is a prime, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 7
- Digital root
- 7
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 422
Primality
421 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
Representations
- In words
- four hundred twenty-one
- Ordinal
- 421st
- Roman numeral
- CDXXI
- Binary
- 110100101
- Octal
- 645
- Hexadecimal
- 1A5
Also seen as
Prime neighborhood
Unicode codepoint
ƥ
U+01A5
Lowercase letter (Ll)
UTF-8 encoding: C6 A5 (2 bytes).
Hex color
#0001A5
RGB(0, 1, 165)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.165.