21667236286128 has 80 divisors (see below), whose sum is σ = 57913619243520. Its totient is φ = 6972183412992.

The previous prime is 21667236286127. The next prime is 21667236286183. The reversal of 21667236286128 is 82168263276612.

It is not an unprimeable number, because it can be changed into a prime (21667236286127) by changing a digit.

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, 6930825 + ... + 9558807.

It is an arithmetic number, because the mean of its divisors is an integer number (723920240544).

Almost surely, 2^{21667236286128} is an apocalyptic number.

It is an amenable number.

21667236286128 is an abundant number, since it is smaller than the sum of its proper divisors (36246382957392).

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

21667236286128 is a wasteful number, since it uses less digits than its factorization.

21667236286128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633946 (or 2633940 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 60.

The spelling of 21667236286128 in words is "twenty-one trillion, six hundred sixty-seven billion, two hundred thirty-six million, two hundred eighty-six thousand, one hundred twenty-eight".