121999903859 has 2 divisors, whose sum is σ = 121999903860. Its totient is φ = 121999903858.

The previous prime is 121999903841. The next prime is 121999903867. The reversal of 121999903859 is 958309999121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121999903859 - 2⁸ = 121999903603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121999903795 and 121999903804.

It is not a weakly prime, because it can be changed into another prime (121999903889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60999951929 + 60999951930.

It is an arithmetic number, because the mean of its divisors is an integer number (60999951930).

Almost surely, 2^121999903859 is an apocalyptic number.

121999903859 is a deficient number, since it is larger than the sum of its proper divisors (1).

121999903859 is an equidigital number, since it uses as much as digits as its factorization.

121999903859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14171760, while the sum is 65.

The spelling of 121999903859 in words is "one hundred twenty-one billion, nine hundred ninety-nine million, nine hundred three thousand, eight hundred fifty-nine".