Advertisement
11,874
pages

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

## Properties

• 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].

Advertisement