21924455680 has 72 divisors (see below), whose sum is σ = 55279980000. Its totient is φ = 8308205568.

The previous prime is 21924455659. The next prime is 21924455687. The reversal of 21924455680 is 8655442912.

It is a self number, because there is not a number n which added to its sum of digits gives 21924455680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924455687) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 426430 + ... + 475069.

It is an arithmetic number, because the mean of its divisors is an integer number (767777500).

Almost surely, 2^21924455680 is an apocalyptic number.

21924455680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21924455680 is an abundant number, since it is smaller than the sum of its proper divisors (33355524320).

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

21924455680 is an equidigital number, since it uses as much as digits as its factorization.

21924455680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901539 (or 901525 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 21924455680 in words is "twenty-one billion, nine hundred twenty-four million, four hundred fifty-five thousand, six hundred eighty".