1311331212111 has 32 divisors (see below), whose sum is σ = 1831276339200. Its totient is φ = 833605395840.

The previous prime is 1311331212067. The next prime is 1311331212137. The reversal of 1311331212111 is 1112121331131.

It is not a de Polignac number, because 1311331212111 - 2¹⁵ = 1311331179343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311331212151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2686066 + ... + 3136496.

It is an arithmetic number, because the mean of its divisors is an integer number (57227385600).

Almost surely, 2^{1311331212111} is an apocalyptic number.

1311331212111 is a deficient number, since it is larger than the sum of its proper divisors (519945127089).

1311331212111 is a wasteful number, since it uses less digits than its factorization.

1311331212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450879.

The product of its digits is 108, while the sum is 21.

Adding to 1311331212111 its reverse (1112121331131), we get a palindrome (2423452543242).

The spelling of 1311331212111 in words is "one trillion, three hundred eleven billion, three hundred thirty-one million, two hundred twelve thousand, one hundred eleven".