1331212311111 has 4 divisors (see below), whose sum is σ = 1774949748152. Its totient is φ = 887474874072.

The previous prime is 1331212311097. The next prime is 1331212311133. The reversal of 1331212311111 is 1111132121331.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1331212311111 - 2⁶ = 1331212311047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331212391111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221868718516 + ... + 221868718521.

It is an arithmetic number, because the mean of its divisors is an integer number (443737437038).

Almost surely, 2^{1331212311111} is an apocalyptic number.

1331212311111 is a deficient number, since it is larger than the sum of its proper divisors (443737437041).

1331212311111 is an equidigital number, since it uses as much as digits as its factorization.

1331212311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443737437040.

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

Adding to 1331212311111 its reverse (1111132121331), we get a palindrome (2442344432442).

The spelling of 1331212311111 in words is "one trillion, three hundred thirty-one billion, two hundred twelve million, three hundred eleven thousand, one hundred eleven".