13111111213 has 2 divisors, whose sum is σ = 13111111214. Its totient is φ = 13111111212.

The previous prime is 13111111187. The next prime is 13111111249. The reversal of 13111111213 is 31211111131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6749772649 + 6361338564 = 82157^2 + 79758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13111111213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13111118213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6555555606 + 6555555607.

It is an arithmetic number, because the mean of its divisors is an integer number (6555555607).

Almost surely, 2^13111111213 is an apocalyptic number.

It is an amenable number.

13111111213 is a deficient number, since it is larger than the sum of its proper divisors (1).

13111111213 is an equidigital number, since it uses as much as digits as its factorization.

13111111213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 16.

Adding to 13111111213 its reverse (31211111131), we get a palindrome (44322222344).

The spelling of 13111111213 in words is "thirteen billion, one hundred eleven million, one hundred eleven thousand, two hundred thirteen".