11131211131111 has 2 divisors, whose sum is σ = 11131211131112. Its totient is φ = 11131211131110.

The previous prime is 11131211131091. The next prime is 11131211131129. The reversal of 11131211131111 is 11113111213111.

It is a m-pointer prime, because the next prime (11131211131129) can be obtained adding 11131211131111 to its product of digits (18).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11131211131111 is a prime.

It is a super-2 number, since 2×11131211131111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11131211131181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565605565555 + 5565605565556.

It is an arithmetic number, because the mean of its divisors is an integer number (5565605565556).

Almost surely, 2^{11131211131111} is an apocalyptic number.

11131211131111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131211131111 is an equidigital number, since it uses as much as digits as its factorization.

11131211131111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 19.

Adding to 11131211131111 its reverse (11113111213111), we get a palindrome (22244322344222).

The spelling of 11131211131111 in words is "eleven trillion, one hundred thirty-one billion, two hundred eleven million, one hundred thirty-one thousand, one hundred eleven".