1213123303312 has 20 divisors (see below), whose sum is σ = 2352924225756. Its totient is φ = 605917051520.

The previous prime is 1213123303289. The next prime is 1213123303313. The reversal of 1213123303312 is 2133033213121.

It can be written as a sum of positive squares in 2 ways, for example, as 994918471936 + 218204831376 = 997456^2 + 467124^2 .

It is not an unprimeable number, because it can be changed into a prime (1213123303313) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 40271983 + ... + 40302094.

Almost surely, 2^{1213123303312} is an apocalyptic number.

It is an amenable number.

1213123303312 is a deficient number, since it is larger than the sum of its proper divisors (1139800922444).

1213123303312 is an equidigital number, since it uses as much as digits as its factorization.

1213123303312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80575026 (or 80575020 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1213123303312 its reverse (2133033213121), we get a palindrome (3346156516433).

The spelling of 1213123303312 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, three hundred three thousand, three hundred twelve".