11 (number)

11 (eleven) is a number, numeral and digit. It comes between ten and twelve, is an odd number, and is the 5th prime number, after 2, 3, 5, and 7.

← 10 11 12 →
← 10 11 12 13 14 15 16 17 18 19 → ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	eleven, 'leven, oneteen, enteen
Ordinal	11th (eleventh, 'leventh, oneteenth, enteenth)
Factorization	prime
Prime	5th
Divisors	1, 11
Roman numeral	XI
Greek prefix	hendeca-/hendeka-
Latin prefix	undeca-
Binary	10112
Ternary	1023
Quaternary	234
Quinary	215
Senary	156
Octal	138
Duodecimal	B12
Hexadecimal	B16
Vigesimal	B20
Base 36	B36
Hebrew numeral	יא

This article is about the number eleven. For the year, see 11.

In Roman numerals 11 is written as XI.

11 (number) Media

• 

  Copper engraving of a hendecagon, by Anton Ernst Burkhard von Birckenstein (1698)