21372925 has 12 divisors (see below), whose sum is σ = 30288736. Its totient is φ = 14655600.

The previous prime is 21372889. The next prime is 21372937. The reversal of 21372925 is 52927312.

It is not a de Polignac number, because 21372925 - 2⁹ = 21372413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60891 + ... + 61240.

Almost surely, 2^21372925 is an apocalyptic number.

21372925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21372925 is a deficient number, since it is larger than the sum of its proper divisors (8915811).

21372925 is a wasteful number, since it uses less digits than its factorization.

21372925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122148 (or 122143 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 21372925 is about 4623.0860904811. The cubic root of 21372925 is about 277.5159745153.

The spelling of 21372925 in words is "twenty-one million, three hundred seventy-two thousand, nine hundred twenty-five".