12138139915 has 16 divisors (see below), whose sum is σ = 16159253760. Its totient is φ = 8678113120.

The previous prime is 12138139883. The next prime is 12138139919. The reversal of 12138139915 is 51993183121.

It is not a de Polignac number, because 12138139915 - 2⁵ = 12138139883 is a prime.

It is a super-2 number, since 2×12138139915² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12138139919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1867039 + ... + 1873528.

It is an arithmetic number, because the mean of its divisors is an integer number (1009953360).

Almost surely, 2^12138139915 is an apocalyptic number.

12138139915 is a deficient number, since it is larger than the sum of its proper divisors (4021113845).

12138139915 is a wasteful number, since it uses less digits than its factorization.

12138139915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740642.

The product of its digits is 58320, while the sum is 43.

The spelling of 12138139915 in words is "twelve billion, one hundred thirty-eight million, one hundred thirty-nine thousand, nine hundred fifteen".