21259372 has 12 divisors (see below), whose sum is σ = 38069416. Its totient is φ = 10382400.

The previous prime is 21259363. The next prime is 21259373. The reversal of 21259372 is 27395212.

It is not an unprimeable number, because it can be changed into a prime (21259373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61629 + ... + 61972.

Almost surely, 2^21259372 is an apocalyptic number.

It is an amenable number.

21259372 is a deficient number, since it is larger than the sum of its proper divisors (16810044).

21259372 is a wasteful number, since it uses less digits than its factorization.

21259372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123648 (or 123646 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 21259372 is about 4610.7886527144. The cubic root of 21259372 is about 277.0236265997.

The spelling of 21259372 in words is "twenty-one million, two hundred fifty-nine thousand, three hundred seventy-two".