21590944048 has 80 divisors (see below), whose sum is σ = 44229669120. Its totient is φ = 10195782912.

The previous prime is 21590944033. The next prime is 21590944051. The reversal of 21590944048 is 84044909512.

It is a junction number, because it is equal to n+sod(n) for n = 21590943989 and 21590944007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3964015 + ... + 3969457.

It is an arithmetic number, because the mean of its divisors is an integer number (552870864).

Almost surely, 2^21590944048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21590944048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22114834560).

21590944048 is an abundant number, since it is smaller than the sum of its proper divisors (22638725072).

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

21590944048 is a wasteful number, since it uses less digits than its factorization.

21590944048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666 (or 5660 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 21590944048 in words is "twenty-one billion, five hundred ninety million, nine hundred forty-four thousand, forty-eight".