9318818021 has 2 divisors, whose sum is σ = 9318818022. Its totient is φ = 9318818020.

The previous prime is 9318818009. The next prime is 9318818029. The reversal of 9318818021 is 1208188139.

9318818021 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., 9096390625 + 222427396 = 95375^2 + 14914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9318818021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9318818021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9318818029) 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, 4659409010 + 4659409011.

It is an arithmetic number, because the mean of its divisors is an integer number (4659409011).

Almost surely, 2^9318818021 is an apocalyptic number.

It is an amenable number.

9318818021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9318818021 is an equidigital number, since it uses as much as digits as its factorization.

9318818021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 9318818021 is about 96534.0251983724. The cubic root of 9318818021 is about 2104.3611575188.

The spelling of 9318818021 in words is "nine billion, three hundred eighteen million, eight hundred eighteen thousand, twenty-one".