921798436673 has 2 divisors, whose sum is σ = 921798436674. Its totient is φ = 921798436672.

The previous prime is 921798436627. The next prime is 921798436709. The reversal of 921798436673 is 376634897129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 896187875584 + 25610561089 = 946672^2 + 160033^2 .

It is an emirp because it is prime and its reverse (376634897129) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921798436673 is a prime.

It is not a weakly prime, because it can be changed into another prime (921798436373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460899218336 + 460899218337.

It is an arithmetic number, because the mean of its divisors is an integer number (460899218337).

Almost surely, 2^921798436673 is an apocalyptic number.

It is an amenable number.

921798436673 is a deficient number, since it is larger than the sum of its proper divisors (1).

921798436673 is an equidigital number, since it uses as much as digits as its factorization.

921798436673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82301184, while the sum is 65.

The spelling of 921798436673 in words is "nine hundred twenty-one billion, seven hundred ninety-eight million, four hundred thirty-six thousand, six hundred seventy-three".