The number 11 (spelled eleven) is the natural number following 10 and preceding 12. Mathematical Facts Prime Number: It is the 5th smallest prime number. Roman Numeral: Written completely as XI. Binary Form: Represented as 1011 in base-2. Common Uses
Sports: The number of players on the field for a single team in soccer, cricket, and American football.
Pop Culture: A primary character in the Netflix series Stranger Things.
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