121121112191 has 2 divisors, whose sum is σ = 121121112192. Its totient is φ = 121121112190.

The previous prime is 121121112187. The next prime is 121121112263. The reversal of 121121112191 is 191211121121.

It is a m-pointer prime, because the next prime (121121112263) can be obtained adding 121121112191 to its product of digits (72).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121121112191 - 2² = 121121112187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121121112121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60560556095 + 60560556096.

It is an arithmetic number, because the mean of its divisors is an integer number (60560556096).

Almost surely, 2^121121112191 is an apocalyptic number.

121121112191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121112191 is an equidigital number, since it uses as much as digits as its factorization.

121121112191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 23.

The spelling of 121121112191 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, one hundred ninety-one".