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# 11 (number)

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| ||||
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Cardinal | eleven | |||

Ordinal |
11th (eleventh) | |||

Factorization | prime | |||

Prime | 5th | |||

Divisors | 1, 11 | |||

Roman numeral | XI | |||

Greek prefix | hendeca-/hendeka- | |||

Latin prefix | undeca- | |||

Binary |
1011_{2} | |||

Ternary |
102_{3} | |||

Quaternary |
23_{4} | |||

Quinary |
21_{5} | |||

Senary |
15_{6} | |||

Octal |
13_{8} | |||

Duodecimal |
B_{12} | |||

Hexadecimal |
B_{16} | |||

Vigesimal |
B_{20} | |||

Base 36 |
B_{36} |

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

**11** (**eleven** ^{i}/ɨˈlɛvɨn/ or /iˈlɛvɛn/) is a number. It comes between ten and twelve, is an odd number, and is a prime number, after 2, 3, 5, and 7.

In Roman numerals, 11 is written as **XI**.