1211221022111 has 2 divisors, whose sum is σ = 1211221022112. Its totient is φ = 1211221022110.

The previous prime is 1211221022107. The next prime is 1211221022119. The reversal of 1211221022111 is 1112201221121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1112201221121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211221022111 - 2² = 1211221022107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211221022111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211221022119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605610511055 + 605610511056.

It is an arithmetic number, because the mean of its divisors is an integer number (605610511056).

Almost surely, 2^{1211221022111} is an apocalyptic number.

1211221022111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211221022111 is an equidigital number, since it uses as much as digits as its factorization.

1211221022111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211221022111 its reverse (1112201221121), we get a palindrome (2323422243232).

The spelling of 1211221022111 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, twenty-two thousand, one hundred eleven".