12131112212 has 24 divisors (see below), whose sum is σ = 22846740840. Its totient is φ = 5615170560.

The previous prime is 12131112173. The next prime is 12131112223. The reversal of 12131112212 is 21221113121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 91317136 + 12039795076 = 9556^2 + 109726^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1458137 + ... + 1466432.

It is an arithmetic number, because the mean of its divisors is an integer number (951947535).

Almost surely, 2^12131112212 is an apocalyptic number.

It is an amenable number.

12131112212 is a deficient number, since it is larger than the sum of its proper divisors (10715628628).

12131112212 is a wasteful number, since it uses less digits than its factorization.

12131112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924651 (or 2924649 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

Adding to 12131112212 its reverse (21221113121), we get a palindrome (33352225333).

Subtracting 12131112212 from its reverse (21221113121), we obtain a palindrome (9090000909).

The spelling of 12131112212 in words is "twelve billion, one hundred thirty-one million, one hundred twelve thousand, two hundred twelve".