12170521065172 has 12 divisors (see below), whose sum is σ = 21298679959060. Its totient is φ = 6085183934016.

The previous prime is 12170521065119. The next prime is 12170521065217. The reversal of 12170521065172 is 27156012507121.

It can be written as a sum of positive squares in 2 ways, for example, as 3423336251076 + 8747184814096 = 1850226^2 + 2957564^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18791403 + ... + 19428274.

Almost surely, 2^{12170521065172} is an apocalyptic number.

It is an amenable number.

12170521065172 is a deficient number, since it is larger than the sum of its proper divisors (9128158893888).

12170521065172 is a wasteful number, since it uses less digits than its factorization.

12170521065172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38299290 (or 38299288 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 40.

The spelling of 12170521065172 in words is "twelve trillion, one hundred seventy billion, five hundred twenty-one million, sixty-five thousand, one hundred seventy-two".