121998120841 has 2 divisors, whose sum is σ = 121998120842. Its totient is φ = 121998120840.

The previous prime is 121998120817. The next prime is 121998120919. The reversal of 121998120841 is 148021899121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121972070025 + 26050816 = 349245^2 + 5104^2 .

It is a cyclic number.

It is not a de Polignac number, because 121998120841 - 2⁵ = 121998120809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121998120791 and 121998120800.

It is not a weakly prime, because it can be changed into another prime (121998520841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60999060420 + 60999060421.

It is an arithmetic number, because the mean of its divisors is an integer number (60999060421).

Almost surely, 2^121998120841 is an apocalyptic number.

It is an amenable number.

121998120841 is a deficient number, since it is larger than the sum of its proper divisors (1).

121998120841 is an equidigital number, since it uses as much as digits as its factorization.

121998120841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 46.

The spelling of 121998120841 in words is "one hundred twenty-one billion, nine hundred ninety-eight million, one hundred twenty thousand, eight hundred forty-one".