21925472 has 24 divisors (see below), whose sum is σ = 43277976. Its totient is φ = 10934272.

The previous prime is 21925471. The next prime is 21925481. The reversal of 21925472 is 27452912.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21925471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17408 + ... + 18624.

It is an arithmetic number, because the mean of its divisors is an integer number (1803249).

Almost surely, 2^21925472 is an apocalyptic number.

It is an amenable number.

21925472 is a deficient number, since it is larger than the sum of its proper divisors (21352504).

21925472 is a wasteful number, since it uses less digits than its factorization.

21925472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790 (or 1782 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 21925472 is about 4682.4643084598. The cubic root of 21925472 is about 279.8871654203.

The spelling of 21925472 in words is "twenty-one million, nine hundred twenty-five thousand, four hundred seventy-two".