1211222210111 has 2 divisors, whose sum is σ = 1211222210112. Its totient is φ = 1211222210110.

The previous prime is 1211222210069. The next prime is 1211222210167. The reversal of 1211222210111 is 1110122221121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211222210111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211222210111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211222210311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605611105055 + 605611105056.

It is an arithmetic number, because the mean of its divisors is an integer number (605611105056).

Almost surely, 2^{1211222210111} is an apocalyptic number.

1211222210111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211222210111 is an equidigital number, since it uses as much as digits as its factorization.

1211222210111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1211222210111 its reverse (1110122221121), we get a palindrome (2321344431232).

The spelling of 1211222210111 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred ten thousand, one hundred eleven".