99129121 has 16 divisors (see below), whose sum is σ = 123558400. Its totient is φ = 77433408.

The previous prime is 99129077. The next prime is 99129127. The reversal of 99129121 is 12192199.

It is not a de Polignac number, because 99129121 - 2⁹ = 99128609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99129127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295 + ... + 14083.

It is an arithmetic number, because the mean of its divisors is an integer number (7722400).

Almost surely, 2^99129121 is an apocalyptic number.

99129121 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

99129121 is a deficient number, since it is larger than the sum of its proper divisors (24429279).

99129121 is a wasteful number, since it uses less digits than its factorization.

99129121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13888.

The product of its digits is 2916, while the sum is 34.

The square root of 99129121 is about 9956.3608311471. The cubic root of 99129121 is about 462.8075321108.

The spelling of 99129121 in words is "ninety-nine million, one hundred twenty-nine thousand, one hundred twenty-one".