21956925 has 12 divisors (see below), whose sum is σ = 36302240. Its totient is φ = 11710320.

The previous prime is 21956887. The next prime is 21956941. The reversal of 21956925 is 52965912.

It is not a de Polignac number, because 21956925 - 2⁶ = 21956861 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146305 + ... + 146454.

Almost surely, 2^21956925 is an apocalyptic number.

21956925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21956925 is a deficient number, since it is larger than the sum of its proper divisors (14345315).

21956925 is a wasteful number, since it uses less digits than its factorization.

21956925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292772 (or 292767 counting only the distinct ones).

The product of its digits is 48600, while the sum is 39.

The square root of 21956925 is about 4685.8216995528. The cubic root of 21956925 is about 280.0209380601.

The spelling of 21956925 in words is "twenty-one million, nine hundred fifty-six thousand, nine hundred twenty-five".