12201221111 has 2 divisors, whose sum is σ = 12201221112. Its totient is φ = 12201221110.

The previous prime is 12201221083. The next prime is 12201221129. The reversal of 12201221111 is 11112210221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12201221111 - 2³⁰ = 11127479287 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12201221141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6100610555 + 6100610556.

It is an arithmetic number, because the mean of its divisors is an integer number (6100610556).

Almost surely, 2^12201221111 is an apocalyptic number.

12201221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12201221111 is an equidigital number, since it uses as much as digits as its factorization.

12201221111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12201221111 its reverse (11112210221), we get a palindrome (23313431332).

The spelling of 12201221111 in words is "twelve billion, two hundred one million, two hundred twenty-one thousand, one hundred eleven".