12212111111 has 2 divisors, whose sum is σ = 12212111112. Its totient is φ = 12212111110.

The previous prime is 12212111057. The next prime is 12212111113. The reversal of 12212111111 is 11111121221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12212111111 - 2³⁰ = 11138369287 is a prime.

It is a Sophie Germain prime.

Together with 12212111113, it forms a pair of twin primes.

It is a Chen prime.

12212111111 is a modest number, since divided by 111111 gives 12212 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212111113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106055555 + 6106055556.

It is an arithmetic number, because the mean of its divisors is an integer number (6106055556).

Almost surely, 2^12212111111 is an apocalyptic number.

12212111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212111111 is an equidigital number, since it uses as much as digits as its factorization.

12212111111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8, while the sum is 14.

Adding to 12212111111 its reverse (11111121221), we get a palindrome (23323232332).

The spelling of 12212111111 in words is "twelve billion, two hundred twelve million, one hundred eleven thousand, one hundred eleven".