21923544720 has 960 divisors, whose sum is σ = 91194163200. Its totient is φ = 4346496000.

The previous prime is 21923544667. The next prime is 21923544749. The reversal of 21923544720 is 2744532912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 308782285 + ... + 308782355.

It is an arithmetic number, because the mean of its divisors is an integer number (94993920).

Almost surely, 2^21923544720 is an apocalyptic number.

21923544720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21923544720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45597081600).

21923544720 is an abundant number, since it is smaller than the sum of its proper divisors (69270618480).

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

21923544720 is a wasteful number, since it uses less digits than its factorization.

21923544720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21923544720 in words is "twenty-one billion, nine hundred twenty-three million, five hundred forty-four thousand, seven hundred twenty".