21322976 has 24 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 10540288.

The previous prime is 21322963. The next prime is 21322991. The reversal of 21322976 is 67922312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 896 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (1769040).

Almost surely, 2^21322976 is an apocalyptic number.

It is an amenable number.

21322976 is a deficient number, since it is larger than the sum of its proper divisors (21133984).

21322976 is an equidigital number, since it uses as much as digits as its factorization.

21322976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7586 (or 7578 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 21322976 is about 4617.6808031738. The cubic root of 21322976 is about 277.2996188881.

The spelling of 21322976 in words is "twenty-one million, three hundred twenty-two thousand, nine hundred seventy-six".