12138512138 has 16 divisors (see below), whose sum is σ = 18358772256. Its totient is φ = 6018982320.

The previous prime is 12138512081. The next prime is 12138512171. The reversal of 12138512138 is 83121583121.

It is a junction number, because it is equal to n+sod(n) for n = 12138512098 and 12138512107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408245 + ... + 436967.

It is an arithmetic number, because the mean of its divisors is an integer number (1147423266).

Almost surely, 2^12138512138 is an apocalyptic number.

12138512138 is a deficient number, since it is larger than the sum of its proper divisors (6220260118).

12138512138 is a wasteful number, since it uses less digits than its factorization.

12138512138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30469.

The product of its digits is 11520, while the sum is 35.

The spelling of 12138512138 in words is "twelve billion, one hundred thirty-eight million, five hundred twelve thousand, one hundred thirty-eight".