21500164036722 has 64 divisors (see below), whose sum is σ = 50614407385344. Its totient is φ = 5959947755520.

The previous prime is 21500164036697. The next prime is 21500164036753. The reversal of 21500164036722 is 22763046100512.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19048279 + ... + 20145402.

It is an arithmetic number, because the mean of its divisors is an integer number (790850115396).

Almost surely, 2^{21500164036722} is an apocalyptic number.

21500164036722 is an abundant number, since it is smaller than the sum of its proper divisors (29114243348622).

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

21500164036722 is a wasteful number, since it uses less digits than its factorization.

21500164036722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39194083.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21500164036722 in words is "twenty-one trillion, five hundred billion, one hundred sixty-four million, thirty-six thousand, seven hundred twenty-two".