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Number

210

210 is a composite number, even, a calendar year.

Abundant Number Harshad / Niven Pentagonal Pronic / Oblong Squarefree Triangular Year

Properties

Parity
Even
Digit count
3
Digit sum
3
Digital root
3
Palindrome
No
Divisor count
16
σ(n) — sum of divisors
576

Primality

Prime factorization: 2 × 3 × 5 × 7

Divisors & multiples

All divisors (16)
1 · 2 · 3 · 5 · 6 · 7 · 10 · 14 · 15 · 21 · 30 · 35 · 42 · 70 · 105 · 210
Aliquot sum (sum of proper divisors): 366
Factor pairs (a × b = 210)
1 × 210
2 × 105
3 × 70
5 × 42
6 × 35
7 × 30
10 × 21
14 × 15
First multiples
210 · 420 · 630 · 840 · 1,050 · 1,260 · 1,470 · 1,680 · 1,890 · 2,100

Representations

In words
two hundred ten
Ordinal
210th
Roman numeral
CCX
Binary
11010010
Octal
322
Hexadecimal
D2

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 210, here are decompositions:

  • 11 + 199 = 210
  • 13 + 197 = 210
  • 17 + 193 = 210
  • 19 + 191 = 210
  • 29 + 181 = 210
  • 31 + 179 = 210
  • 37 + 173 = 210
  • 43 + 167 = 210

Showing the first eight; more decompositions exist.

Unicode codepoint
Ò
U+00D2
Uppercase letter (Lu)

UTF-8 encoding: C3 92 (2 bytes).

Lookup U+00D2 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#0000D2
RGB(0, 0, 210)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.210.