21330660366 has 40 divisors (see below), whose sum is σ = 47805706080. Its totient is φ = 7108847712.

The previous prime is 21330660343. The next prime is 21330660383. The reversal of 21330660366 is 66306603312.

It is a happy number.

21330660366 is a `hidden beast` number, since 2 + 13 + 30 + 6 + 603 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21330660366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1164930 + ... + 1183098.

It is an arithmetic number, because the mean of its divisors is an integer number (1195142652).

Almost surely, 2^21330660366 is an apocalyptic number.

21330660366 is an abundant number, since it is smaller than the sum of its proper divisors (26475045714).

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

21330660366 is a wasteful number, since it uses less digits than its factorization.

21330660366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25430 (or 25421 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 36.

The spelling of 21330660366 in words is "twenty-one billion, three hundred thirty million, six hundred sixty thousand, three hundred sixty-six".