21492152122688 has 28 divisors (see below), whose sum is σ = 45929142398580. Its totient is φ = 9919454825472.

The previous prime is 21492152122681. The next prime is 21492152122699. The reversal of 21492152122688 is 88622125129412.

It can be written as a sum of positive squares in 2 ways, for example, as 7809610306624 + 13682541816064 = 2794568^2 + 3698992^2 .

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492152122681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12915955973 + ... + 12915957636.

It is an arithmetic number, because the mean of its divisors is an integer number (1640326514235).

Almost surely, 2^{21492152122688} is an apocalyptic number.

It is an amenable number.

21492152122688 is an abundant number, since it is smaller than the sum of its proper divisors (24436990275892).

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

21492152122688 is a wasteful number, since it uses less digits than its factorization.

21492152122688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25831913634 (or 25831913624 counting only the distinct ones).

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

The spelling of 21492152122688 in words is "twenty-one trillion, four hundred ninety-two billion, one hundred fifty-two million, one hundred twenty-two thousand, six hundred eighty-eight".