21238566700 has 72 divisors (see below), whose sum is σ = 52245215120. Its totient is φ = 7429190400.

The previous prime is 21238566677. The next prime is 21238566721. The reversal of 21238566700 is 766583212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 405231 + ... + 454630.

Almost surely, 2^21238566700 is an apocalyptic number.

21238566700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21238566700 is an abundant number, since it is smaller than the sum of its proper divisors (31006648420).

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

21238566700 is a wasteful number, since it uses less digits than its factorization.

21238566700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859907 (or 859900 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21238566700 in words is "twenty-one billion, two hundred thirty-eight million, five hundred sixty-six thousand, seven hundred".