1201221101191 has 2 divisors, whose sum is σ = 1201221101192. Its totient is φ = 1201221101190.

The previous prime is 1201221101153. The next prime is 1201221101203. The reversal of 1201221101191 is 1911011221021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1201221101191 - 2¹⁵ = 1201221068423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201221101891) 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, 600610550595 + 600610550596.

It is an arithmetic number, because the mean of its divisors is an integer number (600610550596).

Almost surely, 2^{1201221101191} is an apocalyptic number.

1201221101191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201221101191 is an equidigital number, since it uses as much as digits as its factorization.

1201221101191 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 22.

The spelling of 1201221101191 in words is "one trillion, two hundred one billion, two hundred twenty-one million, one hundred one thousand, one hundred ninety-one".