1311231111212 has 96 divisors (see below), whose sum is σ = 2790777991680. Its totient is φ = 531284382720.

The previous prime is 1311231111173. The next prime is 1311231111227. The reversal of 1311231111212 is 2121111321131.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62479673 + ... + 62500655.

It is an arithmetic number, because the mean of its divisors is an integer number (29070604080).

Almost surely, 2^{1311231111212} is an apocalyptic number.

It is an amenable number.

1311231111212 is an abundant number, since it is smaller than the sum of its proper divisors (1479546880468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311231111212 is a wasteful number, since it uses less digits than its factorization.

1311231111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25431 (or 25429 counting only the distinct ones).

The product of its digits is 72, while the sum is 20.

Adding to 1311231111212 its reverse (2121111321131), we get a palindrome (3432342432343).

The spelling of 1311231111212 in words is "one trillion, three hundred eleven billion, two hundred thirty-one million, one hundred eleven thousand, two hundred twelve".