1211021222111 has 2 divisors, whose sum is σ = 1211021222112. Its totient is φ = 1211021222110.

The previous prime is 1211021222077. The next prime is 1211021222171. The reversal of 1211021222111 is 1112221201121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211021222111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211021222111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211021222171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605510611055 + 605510611056.

It is an arithmetic number, because the mean of its divisors is an integer number (605510611056).

Almost surely, 2^{1211021222111} is an apocalyptic number.

1211021222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211021222111 is an equidigital number, since it uses as much as digits as its factorization.

1211021222111 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 1211021222111 its reverse (1112221201121), we get a palindrome (2323242423232).

The spelling of 1211021222111 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred twenty-two thousand, one hundred eleven".