21164617328 has 10 divisors (see below), whose sum is σ = 41006446104. Its totient is φ = 10582308656.

The previous prime is 21164617303. The next prime is 21164617333. The reversal of 21164617328 is 82371646112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661394276 + ... + 661394307.

Almost surely, 2^21164617328 is an apocalyptic number.

It is an amenable number.

21164617328 is a deficient number, since it is larger than the sum of its proper divisors (19841828776).

21164617328 is a wasteful number, since it uses less digits than its factorization.

21164617328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322788591 (or 1322788585 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The spelling of 21164617328 in words is "twenty-one billion, one hundred sixty-four million, six hundred seventeen thousand, three hundred twenty-eight".