129090921 has 8 divisors (see below), whose sum is σ = 181180320. Its totient is φ = 81531072.

The previous prime is 129090901. The next prime is 129090953.

129090921 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129090921 - 2⁵ = 129090889 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (129090901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1132320 + ... + 1132433.

It is an arithmetic number, because the mean of its divisors is an integer number (22647540).

Almost surely, 2^129090921 is an apocalyptic number.

It is an amenable number.

129090921 is a deficient number, since it is larger than the sum of its proper divisors (52089399).

129090921 is a wasteful number, since it uses less digits than its factorization.

129090921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264775.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 129090921 is about 11361.8185604242. The cubic root of 129090921 is about 505.3961157047.

The spelling of 129090921 in words is "one hundred twenty-nine million, ninety thousand, nine hundred twenty-one".