21492152122689 has 12 divisors (see below), whose sum is σ = 31045264781076. Its totient is φ = 14327619085152.

The previous prime is 21492152122681. The next prime is 21492152122699. The reversal of 21492152122689 is 98622125129412.

It is a happy number.

21492152122689 is a `hidden beast` number, since 2 + 1 + 4 + 92 + 1 + 521 + 2 + 26 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12481438936464 + 9010713186225 = 3532908^2 + 3001785^2 .

It is not a de Polignac number, because 21492152122689 - 2³ = 21492152122681 is a prime.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39911854 + ... + 40446759.

It is an arithmetic number, because the mean of its divisors is an integer number (2587105398423).

Almost surely, 2^{21492152122689} is an apocalyptic number.

It is an amenable number.

21492152122689 is a deficient number, since it is larger than the sum of its proper divisors (9553112658387).

21492152122689 is a wasteful number, since it uses less digits than its factorization.

21492152122689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80388336 (or 80388333 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 21492152122689 in words is "twenty-one trillion, four hundred ninety-two billion, one hundred fifty-two million, one hundred twenty-two thousand, six hundred eighty-nine".