12138522125 has 16 divisors (see below), whose sum is σ = 15356406000. Its totient is φ = 9577785600.

The previous prime is 12138522119. The next prime is 12138522133. The reversal of 12138522125 is 52122583121.

It can be written as a sum of positive squares in 8 ways, for example, as 4349930116 + 7788592009 = 65954^2 + 88253^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12138522125 is a prime.

It is a super-2 number, since 2×12138522125² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12138522091 and 12138522100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 656000 + ... + 674249.

It is an arithmetic number, because the mean of its divisors is an integer number (959775375).

Almost surely, 2^12138522125 is an apocalyptic number.

It is an amenable number.

12138522125 is a deficient number, since it is larger than the sum of its proper divisors (3217883875).

12138522125 is an equidigital number, since it uses as much as digits as its factorization.

12138522125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330337 (or 1330327 counting only the distinct ones).

The product of its digits is 9600, while the sum is 32.

The spelling of 12138522125 in words is "twelve billion, one hundred thirty-eight million, five hundred twenty-two thousand, one hundred twenty-five".