21442639754724 has 96 divisors (see below), whose sum is σ = 53895070580736. Its totient is φ = 6615902240640.

The previous prime is 21442639754719. The next prime is 21442639754741. The reversal of 21442639754724 is 42745793624412.

It is a happy number.

21442639754724 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204324714 + ... + 204429630.

It is an arithmetic number, because the mean of its divisors is an integer number (561406985216).

Almost surely, 2^{21442639754724} is an apocalyptic number.

It is an amenable number.

21442639754724 is an abundant number, since it is smaller than the sum of its proper divisors (32452430826012).

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

21442639754724 is a wasteful number, since it uses less digits than its factorization.

21442639754724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128865 (or 128863 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 60.

The spelling of 21442639754724 in words is "twenty-one trillion, four hundred forty-two billion, six hundred thirty-nine million, seven hundred fifty-four thousand, seven hundred twenty-four".