21707111660 has 24 divisors (see below), whose sum is σ = 49091468496. Its totient is φ = 8014933440.

The previous prime is 21707111651. The next prime is 21707111663. The reversal of 21707111660 is 6611170712.

It is not an unprimeable number, because it can be changed into a prime (21707111663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41744186 + ... + 41744705.

It is an arithmetic number, because the mean of its divisors is an integer number (2045477854).

Almost surely, 2^21707111660 is an apocalyptic number.

21707111660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21707111660 is an abundant number, since it is smaller than the sum of its proper divisors (27384356836).

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

21707111660 is a wasteful number, since it uses less digits than its factorization.

21707111660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83488913 (or 83488911 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 32.

The spelling of 21707111660 in words is "twenty-one billion, seven hundred seven million, one hundred eleven thousand, six hundred sixty".