21138264588 has 48 divisors (see below), whose sum is σ = 56377018880. Its totient is φ = 6038613504.

The previous prime is 21138264577. The next prime is 21138264659. The reversal of 21138264588 is 88546283112.

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, 735945 + ... + 764127.

Almost surely, 2^21138264588 is an apocalyptic number.

21138264588 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21138264588 is an abundant number, since it is smaller than the sum of its proper divisors (35238754292).

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

21138264588 is a wasteful number, since it uses less digits than its factorization.

21138264588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37126 (or 37124 counting only the distinct ones).

The product of its digits is 737280, while the sum is 48.

The spelling of 21138264588 in words is "twenty-one billion, one hundred thirty-eight million, two hundred sixty-four thousand, five hundred eighty-eight".