818867189321 has 2 divisors, whose sum is σ = 818867189322. Its totient is φ = 818867189320.

The previous prime is 818867189303. The next prime is 818867189323. The reversal of 818867189321 is 123981768818.

818867189321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428821974025 + 390045215296 = 654845^2 + 624536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-818867189321 is a prime.

Together with 818867189323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (818867189323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409433594660 + 409433594661.

It is an arithmetic number, because the mean of its divisors is an integer number (409433594661).

Almost surely, 2^818867189321 is an apocalyptic number.

It is an amenable number.

818867189321 is a deficient number, since it is larger than the sum of its proper divisors (1).

818867189321 is an equidigital number, since it uses as much as digits as its factorization.

818867189321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 62.

The spelling of 818867189321 in words is "eight hundred eighteen billion, eight hundred sixty-seven million, one hundred eighty-nine thousand, three hundred twenty-one".