number.wiki
Number

8,221

8,221 is a prime, odd.

Deficient Number Prime Squarefree Twin Prime

Properties

Parity
Odd
Digit count
4
Digit sum
13
Digital root
4
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
8,222

Primality

8,221 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 8221
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 8,221)
1 × 8221
First multiples
8,221 · 16,442 · 24,663 · 32,884 · 41,105 · 49,326 · 57,547 · 65,768 · 73,989 · 82,210

Representations

In words
eight thousand two hundred twenty-one
Ordinal
8221st
Binary
10000000011101
Octal
20035
Hexadecimal
201D

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 8,219 (gap of 2)
  • Next prime: 8,231 (gap of 10)

Pair status: twin with 8219.

Unicode codepoint
U+201D
Final quote (Pf)

UTF-8 encoding: E2 80 9D (3 bytes).

Hex color
#00201D
RGB(0, 32, 29)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.32.29.