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Home > 12 (number)

12 (twelve) is the natural number following 11 and preceding 13.

1 In mathematics

Twelve is a composite numberA composite number is a positive integer with three or more divisors. Every integer (excluding one and zero) is either a prime number or a composite number. The integer 14 is a composite number because it has divisors 1, 2, 7, and 14 (four divisors)., its proper divisors being 1, 2, 3, 4 and 6. Twelve is also a highly composite number, the next one being 24.

Twelve being the product of three and four, the first four positive integers show up in the equation 12 = 3 * 4, which can be continued with the equation 56 = 7 * 8.

A twelve-sided polygon is a dodecagon. A twelve-sided polyhedron is a dodecahedron. Twelve is a pentagonal number.

The number twelve is often used as a sales unit in trade, and is often referred to as a dozen. Twelve dozen are known as a gross. (Note that there are thirteen loaves in a baker's dozen.) The duodecimal system (12₁₀ [twelve] = 10₁₂), which is the use of 12 as a division factor for many historical weights and measures, including hours, probably originates from Mesopotamia. See also: base 12. As Schoolhouse Rock explains in its song "Little Twelvetoes", if humankind had been born with twelve fingers, they would have counted and multiplied using the duodecimal system. (There is no need to have twelve fingers though, since one will easily arrive at the duodecimal system by simply counting the phalanx of fingers with the same hand's thumb, a practice in use with some people until the present day.)

In base thirteen and higher bases (such as hexadecimal), twelve is represented as C.

Etymology (Weekley, Skeat) suggests that "twelve" (similar to "eleven") consists of two parts, the first meaning "two" and the second "leftover", so a literal translation would yield "two remaining [after having ten taken]".

Twelve is a Harshad number.

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12th century11th century 12th century 13th century other centuries) As a means of recording the passage of time, the 12th century was that century which lasted from 1101 to 1200. Events Song dynasty loses power over Northern China The Kamakura Shogunate deprives the 1282Events English conquest of Wales begins under Edward I of England Sicilian Vespers Sicilians rebel against Charles of Anjou and are aided by Peter III of Aragon Births Pope Innocent VI Deaths October 13 Nichiren December 11 Llywelyn the Last, Prince of Wa 12 BCCenturies: 2nd century BC 1st century BC 1st century Decades: 60s BC 50s BC 40s BC 30s BC 20s BC 10s BC 0s 10s 20s 30s 40s Years: 17 BC 16 BC 15 BC 14 BC 13 BC 12 BC 11 BC 10 BC 9 BC 8 BC 7 BC Events Comet Halley makes an appearance Births Marcus Valerius 120sCenturies: 1st century 2nd century 3rd century Decades: 70s 80s 90s 100s 110s 120s 130s 140s 150s 160s 170s 120 121 122 123 124 125 126 127 128 129 Events and trends Significant people Hadrian, Roman Emperor 120s. 125Alternate uses, see Number 125''. Events Construction of the Pantheon ( Rome) as it stands today by Hadrian. The Roman satirist Juvenal's Satires records that bread and circuses keep the Roman people happy. Pope Telesphorus succeeds Pope Sixtus I. Last (4 1299Events First emperor of the Ottoman Empire is Osman I (1299- 1326) The County of Holland is annexed by the County of Hainaut April 1, 1299 Kings Towne on the River Hull granted city status by Royal Charter of King Edward I of England. Births Alfonso IV of 1204 1200s 12 1252 1284 120 121 122 123