121122021201991 has 2 divisors, whose sum is σ = 121122021201992. Its totient is φ = 121122021201990.

The previous prime is 121122021201977. The next prime is 121122021202009. The reversal of 121122021201991 is 199102120221121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121122021201991 - 2⁹ = 121122021201479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121122001201991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60561010600995 + 60561010600996.

It is an arithmetic number, because the mean of its divisors is an integer number (60561010600996).

Almost surely, 2^{121122021201991} is an apocalyptic number.

121122021201991 is a deficient number, since it is larger than the sum of its proper divisors (1).

121122021201991 is an equidigital number, since it uses as much as digits as its factorization.

121122021201991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 121122021201991 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred one thousand, nine hundred ninety-one".