Live analysis

21,006

21,006 is a composite number, even.

This number doesn't have a permanent NumberWiki page yet — what you see below is computed live. Pages get added to the permanent index when they're notable (years, primes, curated, etc.).

Abundant Number Harshad / Niven

Properties

Parity: Even
Digit count: 5
Digit sum: 9
Digital root: 9
Palindrome: No
Divisor count: 16
σ(n) — sum of divisors: 46,800

Primality

Prime factorization: 2 × 3 ³ × 389

Divisors & multiples

All divisors (16)

1 · 2 · 3 · 6 · 9 · 18 · 27 · 54 · 389 · 778 · 1167 · 2334 · 3501 · 7002 · 10503 · 21006

Aliquot sum (sum of proper divisors): 25,794

Factor pairs (a × b = 21,006)

1 × 21006

2 × 10503

3 × 7002

6 × 3501

9 × 2334

18 × 1167

27 × 778

54 × 389

First multiples

21,006 · 42,012 · 63,018 · 84,024 · 105,030 · 126,036 · 147,042 · 168,048 · 189,054 · 210,060

Representations

In words: twenty-one thousand six
Ordinal: 21006th
Binary: 101001000001110
Octal: 51016
Hexadecimal: 520E

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21006, here are decompositions:

5 + 21001 = 21006
23 + 20983 = 21006
43 + 20963 = 21006
47 + 20959 = 21006
59 + 20947 = 21006
67 + 20939 = 21006
103 + 20903 = 21006
107 + 20899 = 21006

Showing the first eight; more decompositions exist.

Unicode codepoint

刎

CJK Unified Ideograph-520E

U+520E

Other letter (Lo)

UTF-8 encoding: E5 88 8E (3 bytes).

Lookup U+520E on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00520E

RGB(0, 82, 14)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.14.