21332546656664 has 32 divisors (see below), whose sum is σ = 41289084393600. Its totient is φ = 10322128892160.

The previous prime is 21332546656661. The next prime is 21332546656667. The reversal of 21332546656664 is 46665664523312.

It is an interprime number because it is at equal distance from previous prime (21332546656661) and next prime (21332546656667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332546656661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62919404 + ... + 63257540.

It is an arithmetic number, because the mean of its divisors is an integer number (1290283887300).

Almost surely, 2^{21332546656664} is an apocalyptic number.

It is an amenable number.

21332546656664 is a deficient number, since it is larger than the sum of its proper divisors (19956537736936).

21332546656664 is a wasteful number, since it uses less digits than its factorization.

21332546656664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592563 (or 592559 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 59.

The spelling of 21332546656664 in words is "twenty-one trillion, three hundred thirty-two billion, five hundred forty-six million, six hundred fifty-six thousand, six hundred sixty-four".