921904409129 has 16 divisors (see below), whose sum is σ = 1062413703360. Its totient is φ = 791159040000.

The previous prime is 921904409021. The next prime is 921904409143.

921904409129 is nontrivially palindromic in base 10.

921904409129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921904409129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (921904409429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7790072 + ... + 7907529.

It is an arithmetic number, because the mean of its divisors is an integer number (66400856460).

Almost surely, 2^921904409129 is an apocalyptic number.

It is an amenable number.

921904409129 is a deficient number, since it is larger than the sum of its proper divisors (140509294231).

921904409129 is a wasteful number, since it uses less digits than its factorization.

921904409129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15697912.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 921904409129 in words is "nine hundred twenty-one billion, nine hundred four million, four hundred nine thousand, one hundred twenty-nine".