21725372 has 12 divisors (see below), whose sum is σ = 38059056. Its totient is φ = 10851360.

The previous prime is 21725369. The next prime is 21725383. The reversal of 21725372 is 27352712.

It is a congruent number.

It is an unprimeable number.

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, 2672 + ... + 7112.

It is an arithmetic number, because the mean of its divisors is an integer number (3171588).

Almost surely, 2^21725372 is an apocalyptic number.

It is an amenable number.

21725372 is a deficient number, since it is larger than the sum of its proper divisors (16333684).

21725372 is a wasteful number, since it uses less digits than its factorization.

21725372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668 (or 5666 counting only the distinct ones).

The product of its digits is 5880, while the sum is 29.

The square root of 21725372 is about 4661.0483799248. The cubic root of 21725372 is about 279.0331105816.

The spelling of 21725372 in words is "twenty-one million, seven hundred twenty-five thousand, three hundred seventy-two".