12131213312 has 28 divisors (see below), whose sum is σ = 24260962146. Its totient is φ = 6065602560.

The previous prime is 12131213293. The next prime is 12131213317. The reversal of 12131213312 is 21331213121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8364199936 + 3767013376 = 91456^2 + 61376^2 .

It is not an unprimeable number, because it can be changed into a prime (12131213317) 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 as a sum of consecutive naturals, namely, 732239 + ... + 748622.

Almost surely, 2^12131213312 is an apocalyptic number.

It is an amenable number.

12131213312 is a deficient number, since it is larger than the sum of its proper divisors (12129748834).

12131213312 is an frugal number, since it uses more digits than its factorization.

12131213312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480887 (or 1480863 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 12131213312 its reverse (21331213121), we get a palindrome (33462426433).

The spelling of 12131213312 in words is "twelve billion, one hundred thirty-one million, two hundred thirteen thousand, three hundred twelve".