21012560700 has 36 divisors (see below), whose sum is σ = 60796343160. Its totient is φ = 5603349440.

The previous prime is 21012560683. The next prime is 21012560747. The reversal of 21012560700 is 706521012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35020635 + ... + 35021234.

It is an arithmetic number, because the mean of its divisors is an integer number (1688787310).

Almost surely, 2^21012560700 is an apocalyptic number.

21012560700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012560700 is an abundant number, since it is smaller than the sum of its proper divisors (39783782460).

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

21012560700 is a wasteful number, since it uses less digits than its factorization.

21012560700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70041886 (or 70041879 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The spelling of 21012560700 in words is "twenty-one billion, twelve million, five hundred sixty thousand, seven hundred".