12111111220111 has 2 divisors, whose sum is σ = 12111111220112. Its totient is φ = 12111111220110.

The previous prime is 12111111220097. The next prime is 12111111220121. The reversal of 12111111220111 is 11102211111121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111111220111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111111220121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055555610055 + 6055555610056.

It is an arithmetic number, because the mean of its divisors is an integer number (6055555610056).

Almost surely, 2^{12111111220111} is an apocalyptic number.

12111111220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111111220111 is an equidigital number, since it uses as much as digits as its factorization.

12111111220111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 12111111220111 its reverse (11102211111121), we get a palindrome (23213322331232).

The spelling of 12111111220111 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty thousand, one hundred eleven".