21580961792 has 48 divisors (see below), whose sum is σ = 46470780720. Its totient is φ = 9960431616.

The previous prime is 21580961783. The next prime is 21580961821. The reversal of 21580961792 is 29716908512.

It is a self number, because there is not a number n which added to its sum of digits gives 21580961792.

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, 378668 + ... + 431915.

It is an arithmetic number, because the mean of its divisors is an integer number (968141265).

Almost surely, 2^21580961792 is an apocalyptic number.

It is an amenable number.

21580961792 is an abundant number, since it is smaller than the sum of its proper divisors (24889818928).

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

21580961792 is an equidigital number, since it uses as much as digits as its factorization.

21580961792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810618 (or 810598 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 21580961792 in words is "twenty-one billion, five hundred eighty million, nine hundred sixty-one thousand, seven hundred ninety-two".