111212231111 has 2 divisors, whose sum is σ = 111212231112. Its totient is φ = 111212231110.

The previous prime is 111212231107. The next prime is 111212231113. The reversal of 111212231111 is 111132212111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111212231111 - 2² = 111212231107 is a prime.

Together with 111212231113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111212231111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111212231113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606115555 + 55606115556.

It is an arithmetic number, because the mean of its divisors is an integer number (55606115556).

Almost surely, 2^111212231111 is an apocalyptic number.

111212231111 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212231111 is an equidigital number, since it uses as much as digits as its factorization.

111212231111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 17.

Adding to 111212231111 its reverse (111132212111), we get a palindrome (222344443222).

The spelling of 111212231111 in words is "one hundred eleven billion, two hundred twelve million, two hundred thirty-one thousand, one hundred eleven".