121898111 has 2 divisors, whose sum is σ = 121898112. Its totient is φ = 121898110.

The previous prime is 121898099. The next prime is 121898141. The reversal of 121898111 is 111898121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121898111 - 2²⁶ = 54789247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121898141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60949055 + 60949056.

It is an arithmetic number, because the mean of its divisors is an integer number (60949056).

Almost surely, 2^121898111 is an apocalyptic number.

121898111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121898111 is an equidigital number, since it uses as much as digits as its factorization.

121898111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 32.

The square root of 121898111 is about 11040.7477554738. The cubic root of 121898111 is about 495.8294578768.

The spelling of 121898111 in words is "one hundred twenty-one million, eight hundred ninety-eight thousand, one hundred eleven".