21793792 has 22 divisors (see below), whose sum is σ = 43568348. Its totient is φ = 10896384.

The previous prime is 21793781. The next prime is 21793799. The reversal of 21793792 is 29739712.

It is not an unprimeable number, because it can be changed into a prime (21793799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9618 + ... + 11665.

Almost surely, 2^21793792 is an apocalyptic number.

It is an amenable number.

21793792 is a deficient number, since it is larger than the sum of its proper divisors (21774556).

21793792 is an equidigital number, since it uses as much as digits as its factorization.

21793792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21303 (or 21285 counting only the distinct ones).

The product of its digits is 47628, while the sum is 40.

The square root of 21793792 is about 4668.3821608776. The cubic root of 21793792 is about 279.3257245013.

The spelling of 21793792 in words is "twenty-one million, seven hundred ninety-three thousand, seven hundred ninety-two".