121011020191 has 2 divisors, whose sum is σ = 121011020192. Its totient is φ = 121011020190.

The previous prime is 121011020183. The next prime is 121011020231. The reversal of 121011020191 is 191020110121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121011020191 - 2³ = 121011020183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121011020161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505510095 + 60505510096.

It is an arithmetic number, because the mean of its divisors is an integer number (60505510096).

Almost surely, 2^121011020191 is an apocalyptic number.

121011020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121011020191 is an equidigital number, since it uses as much as digits as its factorization.

121011020191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 121011020191 in words is "one hundred twenty-one billion, eleven million, twenty thousand, one hundred ninety-one".