121498896866489 has 2 divisors, whose sum is σ = 121498896866490. Its totient is φ = 121498896866488.

The previous prime is 121498896866449. The next prime is 121498896866507. The reversal of 121498896866489 is 984668698894121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62747944249600 + 58750952616889 = 7921360^2 + 7664917^2 .

It is an emirp because it is prime and its reverse (984668698894121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121498896866489 is a prime.

It is not a weakly prime, because it can be changed into another prime (121498896866449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60749448433244 + 60749448433245.

It is an arithmetic number, because the mean of its divisors is an integer number (60749448433245).

Almost surely, 2^{121498896866489} is an apocalyptic number.

It is an amenable number.

121498896866489 is a deficient number, since it is larger than the sum of its proper divisors (1).

121498896866489 is an equidigital number, since it uses as much as digits as its factorization.

121498896866489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20639121408, while the sum is 89.

The spelling of 121498896866489 in words is "one hundred twenty-one trillion, four hundred ninety-eight billion, eight hundred ninety-six million, eight hundred sixty-six thousand, four hundred eighty-nine".