121221112220191 has 2 divisors, whose sum is σ = 121221112220192. Its totient is φ = 121221112220190.

The previous prime is 121221112220113. The next prime is 121221112220203. The reversal of 121221112220191 is 191022211122121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121221112220191 - 2⁷ = 121221112220063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221112220491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610556110095 + 60610556110096.

It is an arithmetic number, because the mean of its divisors is an integer number (60610556110096).

Almost surely, 2^{121221112220191} is an apocalyptic number.

121221112220191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221112220191 is an equidigital number, since it uses as much as digits as its factorization.

121221112220191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 121221112220191 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, one hundred ninety-one".