21929020925 has 12 divisors (see below), whose sum is σ = 31076555616. Its totient is φ = 15037042800.

The previous prime is 21929020909. The next prime is 21929021003. The reversal of 21929020925 is 52902092912.

It is not a de Polignac number, because 21929020925 - 2⁴ = 21929020909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62654171 + ... + 62654520.

It is an arithmetic number, because the mean of its divisors is an integer number (2589712968).

Almost surely, 2^21929020925 is an apocalyptic number.

21929020925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21929020925 is a deficient number, since it is larger than the sum of its proper divisors (9147534691).

21929020925 is a wasteful number, since it uses less digits than its factorization.

21929020925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125308708 (or 125308703 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 21929020925 in words is "twenty-one billion, nine hundred twenty-nine million, twenty thousand, nine hundred twenty-five".