21576961925 has 24 divisors (see below), whose sum is σ = 28352724000. Its totient is φ = 16243260480.

The previous prime is 21576961919. The next prime is 21576961937. The reversal of 21576961925 is 52916967512.

It is not a de Polignac number, because 21576961925 - 2¹⁰ = 21576960901 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81659 + ... + 223208.

It is an arithmetic number, because the mean of its divisors is an integer number (1181363500).

Almost surely, 2^21576961925 is an apocalyptic number.

21576961925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21576961925 is a deficient number, since it is larger than the sum of its proper divisors (6775762075).

21576961925 is a wasteful number, since it uses less digits than its factorization.

21576961925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305045 (or 305040 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 53.

The spelling of 21576961925 in words is "twenty-one billion, five hundred seventy-six million, nine hundred sixty-one thousand, nine hundred twenty-five".