21331792 has 20 divisors (see below), whose sum is σ = 41413396. Its totient is φ = 10644480.

The previous prime is 21331789. The next prime is 21331819. The reversal of 21331792 is 29713312.

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 3825936 = 4184^2 + 1956^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21331792.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9568 + ... + 11584.

Almost surely, 2^21331792 is an apocalyptic number.

It is an amenable number.

21331792 is a deficient number, since it is larger than the sum of its proper divisors (20081604).

21331792 is a wasteful number, since it uses less digits than its factorization.

21331792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686 (or 2680 counting only the distinct ones).

The product of its digits is 2268, while the sum is 28.

The square root of 21331792 is about 4618.6352962753. The cubic root of 21331792 is about 277.3378301991.

The spelling of 21331792 in words is "twenty-one million, three hundred thirty-one thousand, seven hundred ninety-two".