21660307000 has 64 divisors (see below), whose sum is σ = 51516167040. Its totient is φ = 8522064000.

The previous prime is 21660306991. The next prime is 21660307013. The reversal of 21660307000 is 70306612.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116544 + ... + 238543.

It is an arithmetic number, because the mean of its divisors is an integer number (804940110).

Almost surely, 2^21660307000 is an apocalyptic number.

21660307000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21660307000 is an abundant number, since it is smaller than the sum of its proper divisors (29855860040).

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

21660307000 is a wasteful number, since it uses less digits than its factorization.

21660307000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355169 (or 355155 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The spelling of 21660307000 in words is "twenty-one billion, six hundred sixty million, three hundred seven thousand".