21666331064336 has 80 divisors (see below), whose sum is σ = 50800734616320. Its totient is φ = 8738809528320.

The previous prime is 21666331064221. The next prime is 21666331064359. The reversal of 21666331064336 is 63346013366612.

It is a super-2 number, since 2×21666331064336² (a number of 27 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 30553280 + ... + 31254368.

It is an arithmetic number, because the mean of its divisors is an integer number (635009182704).

Almost surely, 2^{21666331064336} is an apocalyptic number.

It is an amenable number.

21666331064336 is an abundant number, since it is smaller than the sum of its proper divisors (29134403551984).

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

21666331064336 is a wasteful number, since it uses less digits than its factorization.

21666331064336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717352 (or 717346 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 50.

The spelling of 21666331064336 in words is "twenty-one trillion, six hundred sixty-six billion, three hundred thirty-one million, sixty-four thousand, three hundred thirty-six".