312103242220921 has 2 divisors, whose sum is σ = 312103242220922. Its totient is φ = 312103242220920.

The previous prime is 312103242220769. The next prime is 312103242221009. The reversal of 312103242220921 is 129022242301213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312075684560896 + 27557660025 = 17665664^2 + 166005^2 .

It is an emirp because it is prime and its reverse (129022242301213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312103242220921 - 2²¹ = 312103240123769 is a prime.

It is not a weakly prime, because it can be changed into another prime (312103242220421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156051621110460 + 156051621110461.

It is an arithmetic number, because the mean of its divisors is an integer number (156051621110461).

Almost surely, 2^{312103242220921} is an apocalyptic number.

It is an amenable number.

312103242220921 is a deficient number, since it is larger than the sum of its proper divisors (1).

312103242220921 is an equidigital number, since it uses as much as digits as its factorization.

312103242220921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 312103242220921 in words is "three hundred twelve trillion, one hundred three billion, two hundred forty-two million, two hundred twenty thousand, nine hundred twenty-one".