21925804 has 24 divisors (see below), whose sum is σ = 39904256. Its totient is φ = 10530000.

The previous prime is 21925789. The next prime is 21925807. The reversal of 21925804 is 40852912.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21925807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18139 + ... + 19309.

Almost surely, 2^21925804 is an apocalyptic number.

It is an amenable number.

21925804 is a deficient number, since it is larger than the sum of its proper divisors (17978452).

21925804 is a wasteful number, since it uses less digits than its factorization.

21925804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21925804 is about 4682.4997597437. The cubic root of 21925804 is about 279.8885781162. Note that the first 3 decimals are identical.

The spelling of 21925804 in words is "twenty-one million, nine hundred twenty-five thousand, eight hundred four".