21873792 has 32 divisors (see below), whose sum is σ = 58103280. Its totient is φ = 7291136.

The previous prime is 21873779. The next prime is 21873809. The reversal of 21873792 is 29737812.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21873792.

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, 28098 + ... + 28865.

Almost surely, 2^21873792 is an apocalyptic number.

It is an amenable number.

21873792 is an abundant number, since it is smaller than the sum of its proper divisors (36229488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21873792 is an equidigital number, since it uses as much as digits as its factorization.

21873792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56980 (or 56968 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 21873792 is about 4676.9425910524. The cubic root of 21873792 is about 279.6670873256.

The spelling of 21873792 in words is "twenty-one million, eight hundred seventy-three thousand, seven hundred ninety-two".