1210111221191 has 2 divisors, whose sum is σ = 1210111221192. Its totient is φ = 1210111221190.

The previous prime is 1210111221167. The next prime is 1210111221223. The reversal of 1210111221191 is 1911221110121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210111221191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210111221101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605055610595 + 605055610596.

It is an arithmetic number, because the mean of its divisors is an integer number (605055610596).

Almost surely, 2^{1210111221191} is an apocalyptic number.

1210111221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210111221191 is an equidigital number, since it uses as much as digits as its factorization.

1210111221191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 23.

The spelling of 1210111221191 in words is "one trillion, two hundred ten billion, one hundred eleven million, two hundred twenty-one thousand, one hundred ninety-one".