Googology Wiki
Googology Wiki

12 (twelve) is a positive integer following 11 and preceding 13. Its ordinal form is written "12th" or "twelfth".


  • 12 is an even composite number, and the 3rd Superior Highly Composite number (SHCN).
  • 12 is the smallest number with six divisors.
  • 12 is the first abundant number.
  • 12 is the second semiperfect number.
  • 12 is a friendly number.
  • A set of 12 objects is often called a dozen. That type of set gets its own name because many things are grouped in twelve: for example, twelve months in a year, twelve inches in a foot, twelve eggs in a typical container, etc.
  • There are 12 size-3 Latin squares.

In googology

  • In Greek-based number-naming systems, 12 is associated with prefix "dodeka-", and with prefix "duodeci-" in Latin systems.
  • In the Czech and Slovak languages, 12 is called tucet.
  • Aarex Tiaokhiao coined the name duodecimal-uoonol for this number.[1]
  • DeepLineMadom calls the number zeroogolplex, and is equal to 10[0]10[0]100 in DeepLineMadom's Array Notation[2].

See also