121020191 has 2 divisors, whose sum is σ = 121020192. Its totient is φ = 121020190.

The previous prime is 121020173. The next prime is 121020209. The reversal of 121020191 is 191020121.

It is a balanced prime because it is at equal distance from previous prime (121020173) and next prime (121020209).

It is a cyclic number.

It is not a de Polignac number, because 121020191 - 2²⁶ = 53911327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121020131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510095 + 60510096.

It is an arithmetic number, because the mean of its divisors is an integer number (60510096).

Almost surely, 2^121020191 is an apocalyptic number.

121020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020191 is an equidigital number, since it uses as much as digits as its factorization.

121020191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 121020191 is about 11000.9177344438. The cubic root of 121020191 is about 494.6362542139.

The spelling of 121020191 in words is "one hundred twenty-one million, twenty thousand, one hundred ninety-one".