21660366226364 has 48 divisors (see below), whose sum is σ = 38563523026560. Its totient is φ = 10642557159360.

The previous prime is 21660366226319. The next prime is 21660366226381. The reversal of 21660366226364 is 46362266306612.

It is a happy number.

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, 2287981559 + ... + 2287991025.

It is an arithmetic number, because the mean of its divisors is an integer number (803406729720).

Almost surely, 2^{21660366226364} is an apocalyptic number.

It is an amenable number.

21660366226364 is a deficient number, since it is larger than the sum of its proper divisors (16903156800196).

21660366226364 is a wasteful number, since it uses less digits than its factorization.

21660366226364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17418 (or 17416 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 53.

The spelling of 21660366226364 in words is "twenty-one trillion, six hundred sixty billion, three hundred sixty-six million, two hundred twenty-six thousand, three hundred sixty-four".