number.wiki
Number

1,021

1,021 is a prime, odd, a calendar year.

Deficient Number Prime Squarefree Twin Prime Year

Properties

Parity
Odd
Digit count
4
Digit sum
4
Digital root
4
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
1,022

Primality

1,021 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 1021
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 1,021)
1 × 1021
First multiples
1,021 · 2,042 · 3,063 · 4,084 · 5,105 · 6,126 · 7,147 · 8,168 · 9,189 · 10,210

Representations

In words
one thousand twenty-one
Ordinal
1021st
Roman numeral
MXXI
Binary
1111111101
Octal
1775
Hexadecimal
3FD

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 1,019 (gap of 2)
  • Next prime: 1,031 (gap of 10)

Pair status: twin with 1019.

Unicode codepoint
Ͻ
U+03FD
Uppercase letter (Lu)

UTF-8 encoding: CF BD (2 bytes).

Lookup U+03FD on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#0003FD
RGB(0, 3, 253)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.253.