21662661026720 has 96 divisors (see below), whose sum is σ = 58491325767168. Its totient is φ = 7426926194688.

The previous prime is 21662661026623. The next prime is 21662661026729. The reversal of 21662661026720 is 2762016626612.

It is not an unprimeable number, because it can be changed into a prime (21662661026729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31538792 + ... + 32218328.

It is an arithmetic number, because the mean of its divisors is an integer number (609284643408).

Almost surely, 2^{21662661026720} is an apocalyptic number.

21662661026720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21662661026720 is an abundant number, since it is smaller than the sum of its proper divisors (36828664740448).

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

21662661026720 is a wasteful number, since it uses less digits than its factorization.

21662661026720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708022 (or 708014 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 21662661026720 in words is "twenty-one trillion, six hundred sixty-two billion, six hundred sixty-one million, twenty-six thousand, seven hundred twenty".