1212110121191 has 2 divisors, whose sum is σ = 1212110121192. Its totient is φ = 1212110121190.

The previous prime is 1212110121121. The next prime is 1212110121193. The reversal of 1212110121191 is 1911210112121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212110121191 is a prime.

Together with 1212110121193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212110121193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606055060595 + 606055060596.

It is an arithmetic number, because the mean of its divisors is an integer number (606055060596).

Almost surely, 2^{1212110121191} is an apocalyptic number.

1212110121191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212110121191 is an equidigital number, since it uses as much as digits as its factorization.

1212110121191 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 1212110121191 in words is "one trillion, two hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, one hundred ninety-one".