21588385116 has 48 divisors (see below), whose sum is σ = 52236713984. Its totient is φ = 6933646656.

The previous prime is 21588385099. The next prime is 21588385201. The reversal of 21588385116 is 61158388512.

It is a congruent number.

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, 190300 + ... + 281763.

Almost surely, 2^21588385116 is an apocalyptic number.

It is an amenable number.

21588385116 is an abundant number, since it is smaller than the sum of its proper divisors (30648328868).

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

21588385116 is a wasteful number, since it uses less digits than its factorization.

21588385116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472210 (or 472208 counting only the distinct ones).

The product of its digits is 460800, while the sum is 48.

The spelling of 21588385116 in words is "twenty-one billion, five hundred eighty-eight million, three hundred eighty-five thousand, one hundred sixteen".