21660113103720 has 256 divisors, whose sum is σ = 81331326720000. Its totient is φ = 4492587303936.

The previous prime is 21660113103719. The next prime is 21660113103823. The reversal of 21660113103720 is 2730131106612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16165270 + ... + 17453829.

It is an arithmetic number, because the mean of its divisors is an integer number (317700495000).

Almost surely, 2^{21660113103720} is an apocalyptic number.

21660113103720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21660113103720 is an abundant number, since it is smaller than the sum of its proper divisors (59671213616280).

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

21660113103720 is a wasteful number, since it uses less digits than its factorization.

21660113103720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33619192 (or 33619188 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 21660113103720 in words is "twenty-one trillion, six hundred sixty billion, one hundred thirteen million, one hundred three thousand, seven hundred twenty".