21938677517502 has 24 divisors (see below), whose sum is σ = 50329907246736. Its totient is φ = 6882722358336.

The previous prime is 21938677517501. The next prime is 21938677517507. The reversal of 21938677517502 is 20571577683912.

It is a happy number.

21938677517502 is a `hidden beast` number, since 2 + 1 + 9 + 3 + 8 + 6 + 77 + 51 + 7 + 502 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21938677517502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21938677517501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35847511978 + ... + 35847512589.

It is an arithmetic number, because the mean of its divisors is an integer number (2097079468614).

Almost surely, 2^{21938677517502} is an apocalyptic number.

21938677517502 is an abundant number, since it is smaller than the sum of its proper divisors (28391229729234).

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

21938677517502 is a wasteful number, since it uses less digits than its factorization.

21938677517502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71695024592 (or 71695024589 counting only the distinct ones).

The product of its (nonzero) digits is 44452800, while the sum is 63.

The spelling of 21938677517502 in words is "twenty-one trillion, nine hundred thirty-eight billion, six hundred seventy-seven million, five hundred seventeen thousand, five hundred two".