1921317240317 has 2 divisors, whose sum is σ = 1921317240318. Its totient is φ = 1921317240316.

The previous prime is 1921317240287. The next prime is 1921317240331. The reversal of 1921317240317 is 7130427131291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1787638524676 + 133678715641 = 1337026^2 + 365621^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921317240317 - 2²⁴ = 1921300463101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921317240617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960658620158 + 960658620159.

It is an arithmetic number, because the mean of its divisors is an integer number (960658620159).

Almost surely, 2^{1921317240317} is an apocalyptic number.

It is an amenable number.

1921317240317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921317240317 is an equidigital number, since it uses as much as digits as its factorization.

1921317240317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 1921317240317 in words is "one trillion, nine hundred twenty-one billion, three hundred seventeen million, two hundred forty thousand, three hundred seventeen".