21850065700 has 18 divisors (see below), whose sum is σ = 47414642786. Its totient is φ = 8740026240.

The previous prime is 21850065667. The next prime is 21850065703. The reversal of 21850065700 is 756005812.

It can be written as a sum of positive squares in 3 ways, for example, as 3959933184 + 17890132516 = 62928^2 + 133754^2 .

It is not an unprimeable number, because it can be changed into a prime (21850065703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109250229 + ... + 109250428.

Almost surely, 2^21850065700 is an apocalyptic number.

21850065700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21850065700 is an abundant number, since it is smaller than the sum of its proper divisors (25564577086).

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

21850065700 is a wasteful number, since it uses less digits than its factorization.

21850065700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218500671 (or 218500664 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 21850065700 in words is "twenty-one billion, eight hundred fifty million, sixty-five thousand, seven hundred".