12131123212 has 12 divisors (see below), whose sum is σ = 22862501536. Its totient is φ = 5598979920.

The previous prime is 12131123203. The next prime is 12131123219. The reversal of 12131123212 is 21232113121.

It is a self number, because there is not a number n which added to its sum of digits gives 12131123212.

It is not an unprimeable number, because it can be changed into a prime (12131123219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116645364 + ... + 116645467.

Almost surely, 2^12131123212 is an apocalyptic number.

It is an amenable number.

12131123212 is a deficient number, since it is larger than the sum of its proper divisors (10731378324).

12131123212 is a wasteful number, since it uses less digits than its factorization.

12131123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233290848 (or 233290846 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 12131123212 its reverse (21232113121), we get a palindrome (33363236333).

The spelling of 12131123212 in words is "twelve billion, one hundred thirty-one million, one hundred twenty-three thousand, two hundred twelve".