921839809923 has 12 divisors (see below), whose sum is σ = 1364023133928. Its totient is φ = 599570607840.

The previous prime is 921839809819. The next prime is 921839809939. The reversal of 921839809923 is 329908938129.

921839809923 is a `hidden beast` number, since 9 + 218 + 398 + 0 + 9 + 9 + 23 = 666.

It is not a de Polignac number, because 921839809923 - 2⁹ = 921839809411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921839809973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1249105065 + ... + 1249105802.

It is an arithmetic number, because the mean of its divisors is an integer number (113668594494).

Almost surely, 2^921839809923 is an apocalyptic number.

921839809923 is a deficient number, since it is larger than the sum of its proper divisors (442183324005).

921839809923 is a wasteful number, since it uses less digits than its factorization.

921839809923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498210914 (or 2498210911 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 921839809923 in words is "nine hundred twenty-one billion, eight hundred thirty-nine million, eight hundred nine thousand, nine hundred twenty-three".