121002001020191 has 2 divisors, whose sum is σ = 121002001020192. Its totient is φ = 121002001020190.

The previous prime is 121002001020167. The next prime is 121002001020223. The reversal of 121002001020191 is 191020100200121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121002001020191 - 2²² = 121001996825887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121002001020151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501000510095 + 60501000510096.

It is an arithmetic number, because the mean of its divisors is an integer number (60501000510096).

Almost surely, 2^{121002001020191} is an apocalyptic number.

121002001020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121002001020191 is an equidigital number, since it uses as much as digits as its factorization.

121002001020191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 121002001020191 in words is "one hundred twenty-one trillion, two billion, one million, twenty thousand, one hundred ninety-one".