21663365134064 has 40 divisors (see below), whose sum is σ = 42022317259680. Its totient is φ = 10818903045888.

The previous prime is 21663365134027. The next prime is 21663365134139. The reversal of 21663365134064 is 46043156336612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50593382 + ... + 51019770.

It is an arithmetic number, because the mean of its divisors is an integer number (1050557931492).

Almost surely, 2^{21663365134064} is an apocalyptic number.

It is an amenable number.

21663365134064 is a deficient number, since it is larger than the sum of its proper divisors (20358952125616).

21663365134064 is a wasteful number, since it uses less digits than its factorization.

21663365134064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430137 (or 430131 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 50.

The spelling of 21663365134064 in words is "twenty-one trillion, six hundred sixty-three billion, three hundred sixty-five million, one hundred thirty-four thousand, sixty-four".