21364925 has 12 divisors (see below), whose sum is σ = 26560800. Its totient is φ = 17047920.

The previous prime is 21364919. The next prime is 21364939. The reversal of 21364925 is 52946312.

It is a happy number.

It is not a de Polignac number, because 21364925 - 2⁸ = 21364669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21364891 and 21364900.

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, 11726 + ... + 13424.

It is an arithmetic number, because the mean of its divisors is an integer number (2213400).

Almost surely, 2^21364925 is an apocalyptic number.

21364925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21364925 is a deficient number, since it is larger than the sum of its proper divisors (5195875).

21364925 is a wasteful number, since it uses less digits than its factorization.

21364925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212 (or 2207 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 21364925 is about 4622.2207865917. The cubic root of 21364925 is about 277.4813449570.

The spelling of 21364925 in words is "twenty-one million, three hundred sixty-four thousand, nine hundred twenty-five".