12138111852 has 12 divisors (see below), whose sum is σ = 28322261016. Its totient is φ = 4046037280.

The previous prime is 12138111851. The next prime is 12138111889. The reversal of 12138111852 is 25811183121.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (12138111851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505754649 + ... + 505754672.

It is an arithmetic number, because the mean of its divisors is an integer number (2360188418).

Almost surely, 2^12138111852 is an apocalyptic number.

12138111852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12138111852 is an abundant number, since it is smaller than the sum of its proper divisors (16184149164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12138111852 is a wasteful number, since it uses less digits than its factorization.

12138111852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011509328 (or 1011509326 counting only the distinct ones).

The product of its digits is 3840, while the sum is 33.

Adding to 12138111852 its reverse (25811183121), we get a palindrome (37949294973).

The spelling of 12138111852 in words is "twelve billion, one hundred thirty-eight million, one hundred eleven thousand, eight hundred fifty-two".