21959372 has 6 divisors (see below), whose sum is σ = 38428908. Its totient is φ = 10979684.

The previous prime is 21959341. The next prime is 21959407. The reversal of 21959372 is 27395912.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2744918 + ... + 2744925.

It is an arithmetic number, because the mean of its divisors is an integer number (6404818).

Almost surely, 2^21959372 is an apocalyptic number.

It is an amenable number.

21959372 is a deficient number, since it is larger than the sum of its proper divisors (16469536).

21959372 is a wasteful number, since it uses less digits than its factorization.

21959372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489847 (or 5489845 counting only the distinct ones).

The product of its digits is 34020, while the sum is 38.

The square root of 21959372 is about 4686.0827990978. The cubic root of 21959372 is about 280.0313400294.

The spelling of 21959372 in words is "twenty-one million, nine hundred fifty-nine thousand, three hundred seventy-two".