121202818391 has 2 divisors, whose sum is σ = 121202818392. Its totient is φ = 121202818390.

The previous prime is 121202818351. The next prime is 121202818439. The reversal of 121202818391 is 193818202121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121202818391 - 2¹⁰ = 121202817367 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121202818301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60601409195 + 60601409196.

It is an arithmetic number, because the mean of its divisors is an integer number (60601409196).

Almost surely, 2^121202818391 is an apocalyptic number.

121202818391 is a deficient number, since it is larger than the sum of its proper divisors (1).

121202818391 is an equidigital number, since it uses as much as digits as its factorization.

121202818391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 38.

The spelling of 121202818391 in words is "one hundred twenty-one billion, two hundred two million, eight hundred eighteen thousand, three hundred ninety-one".