21502663630 has 96 divisors (see below), whose sum is σ = 45433496160. Its totient is φ = 7305661440.

The previous prime is 21502663621. The next prime is 21502663643. The reversal of 21502663630 is 3636620512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37789986 + ... + 37790554.

It is an arithmetic number, because the mean of its divisors is an integer number (473265585).

Almost surely, 2^21502663630 is an apocalyptic number.

21502663630 is an abundant number, since it is smaller than the sum of its proper divisors (23930832530).

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

21502663630 is a wasteful number, since it uses less digits than its factorization.

21502663630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 1147 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

The spelling of 21502663630 in words is "twenty-one billion, five hundred two million, six hundred sixty-three thousand, six hundred thirty".