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105 is a number following 104 and preciding 106. Its prime factorization is 3*5*7.

It is the 14th triangular number excluding 0. If you count 0 it is the 15th triangular number.

It is a dodecagonal number following 64 and preciding 156.

It is the first ever Zeisel number.

It is the first odd sphenic number and is the product of 3 consecutive prime numbers. (3, 5, 7)

It is the double factorial of 7.

It is also the sum of the first five square pyramidal numbers. (Being 1, 5, 14, 30, and 55)

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