12103242312 has 128 divisors (see below), whose sum is σ = 35486035200. Its totient is φ = 3367833600.

The previous prime is 12103242299. The next prime is 12103242317. The reversal of 12103242312 is 21324230121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (12103242317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5240614 + ... + 5242922.

It is an arithmetic number, because the mean of its divisors is an integer number (277234650).

Almost surely, 2^12103242312 is an apocalyptic number.

12103242312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12103242312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17743017600).

12103242312 is an abundant number, since it is smaller than the sum of its proper divisors (23382792888).

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

12103242312 is a wasteful number, since it uses less digits than its factorization.

12103242312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127 (or 3123 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 12103242312 its reverse (21324230121), we get a palindrome (33427472433).

The spelling of 12103242312 in words is "twelve billion, one hundred three million, two hundred forty-two thousand, three hundred twelve".