21938677517456 has 40 divisors (see below), whose sum is σ = 48581997767424. Its totient is φ = 9401613419520.

The previous prime is 21938677517453. The next prime is 21938677517501. The reversal of 21938677517456 is 65471577683912.

21938677517456 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21938677517456.

It is not an unprimeable number, because it can be changed into a prime (21938677517453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5487425 + ... + 8601696.

Almost surely, 2^{21938677517456} is an apocalyptic number.

It is an amenable number.

21938677517456 is an abundant number, since it is smaller than the sum of its proper divisors (26643320249968).

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

21938677517456 is a wasteful number, since it uses less digits than its factorization.

21938677517456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14103039 (or 14103033 counting only the distinct ones).

The product of its digits is 533433600, while the sum is 71.

The spelling of 21938677517456 in words is "twenty-one trillion, nine hundred thirty-eight billion, six hundred seventy-seven million, five hundred seventeen thousand, four hundred fifty-six".