21936604 has 12 divisors (see below), whose sum is σ = 38962504. Its totient is φ = 10804464.

The previous prime is 21936571. The next prime is 21936611. The reversal of 21936604 is 40663912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40659 + ... + 41194.

Almost surely, 2^21936604 is an apocalyptic number.

It is an amenable number.

21936604 is a deficient number, since it is larger than the sum of its proper divisors (17025900).

21936604 is a wasteful number, since it uses less digits than its factorization.

21936604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81924 (or 81922 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 21936604 is about 4683.6528479382. The cubic root of 21936604 is about 279.9345255071.

The spelling of 21936604 in words is "twenty-one million, nine hundred thirty-six thousand, six hundred four".