12221212111111 has 2 divisors, whose sum is σ = 12221212111112. Its totient is φ = 12221212111110.

The previous prime is 12221212111109. The next prime is 12221212111123. The reversal of 12221212111111 is 11111121212221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12221212111111 - 2¹ = 12221212111109 is a prime.

Together with 12221212111109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221212111181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110606055555 + 6110606055556.

It is an arithmetic number, because the mean of its divisors is an integer number (6110606055556).

Almost surely, 2^{12221212111111} is an apocalyptic number.

12221212111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221212111111 is an equidigital number, since it uses as much as digits as its factorization.

12221212111111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32, while the sum is 19.

Adding to 12221212111111 its reverse (11111121212221), we get a palindrome (23332333323332).

The spelling of 12221212111111 in words is "twelve trillion, two hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred eleven".