12121231312 has 10 divisors (see below), whose sum is σ = 23484885698. Its totient is φ = 6060615648.

The previous prime is 12121231301. The next prime is 12121231327. The reversal of 12121231312 is 21313212121.

It can be written as a sum of positive squares in only one way, i.e., 6785805376 + 5335425936 = 82376^2 + 73044^2 .

It is a super-3 number, since 3×12121231312³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12121231312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 378788463 + ... + 378788494.

Almost surely, 2^12121231312 is an apocalyptic number.

It is an amenable number.

12121231312 is a deficient number, since it is larger than the sum of its proper divisors (11363654386).

12121231312 is an equidigital number, since it uses as much as digits as its factorization.

12121231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757576965 (or 757576959 counting only the distinct ones).

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

Adding to 12121231312 its reverse (21313212121), we get a palindrome (33434443433).

The spelling of 12121231312 in words is "twelve billion, one hundred twenty-one million, two hundred thirty-one thousand, three hundred twelve".