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29 (twenty-nine) is the natural number following 28 and preceding 30.

It is the tenth prime number, and also the fourth primorial prime. It forms a twin prime pair with thirty-one, which is also a primorial prime. Twenty-nine is also the sixth Sophie Germain prime. It is also the sum of three consecutive squares, 22 + 32 + 42. It is a Lucas prime, a Pell prime, and a tetranacci number. It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. Since 18! + 1 is a multiple of 29 but 29 is not one more than a multiple 18, 29 is a Pillai prime. 29 is also the 10th supersingular prime.

None of the first 29 natural numbers have more than two different prime factors. This is the longest such consecutive sequence.

Twenty-nine is the aliquot sum of the odd discrete biprimes 115 and 187 and is the base of the 29-aliquot tree.

The lunar month is very close to twenty-nine days.
Saturn requires over 29 years to orbit the Sun.

In other fields
Twenty-nine is:
The number of days February has in leap years.
The number of letters in the Turkish,[1] Finnish,[2] Faroese,[3] and Norwegian[4] alphabets.
The designation of Interstate 29, a U. S. freeway that runs from Missouri to North Dakota.
In the name of the town Twentynine Palms, California, also the name of the adjoining Marine Corps Air Ground Combat Center Twentynine Palms, affectionately referred to by Marines as "Twentynine Stumps".[5]
The number of suras in the Qur'an that begin with muqatta'at
The highest possible score in a hand of Cribbage.
An album by Ryan Adams.[6]
The track the Chattanooga Choo Choo leaves in the Glenn Miller song.
29th Regiment of Foot, a former regiment in the British Army.
The retired jersey number of Rod Carew
The 2008 Summer Olympics
The number of the French department Finistère
The amount of attributes existing according to The Strokes in You Only Live Once.
The retired S.L. Benfica shirt number in memory of Miklos Feher.