21158388123164 has 96 divisors (see below), whose sum is σ = 38188226926080. Its totient is φ = 10251801762048.

The previous prime is 21158388123163. The next prime is 21158388123167. The reversal of 21158388123164 is 46132188385112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21158388123163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15477971609 + ... + 15477972975.

It is an arithmetic number, because the mean of its divisors is an integer number (397794030480).

Almost surely, 2^{21158388123164} is an apocalyptic number.

It is an amenable number.

21158388123164 is a deficient number, since it is larger than the sum of its proper divisors (17029838802916).

21158388123164 is a wasteful number, since it uses less digits than its factorization.

21158388123164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859 (or 2857 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The spelling of 21158388123164 in words is "twenty-one trillion, one hundred fifty-eight billion, three hundred eighty-eight million, one hundred twenty-three thousand, one hundred sixty-four".