804310021 has 2 divisors, whose sum is σ = 804310022. Its totient is φ = 804310020.

The previous prime is 804309991. The next prime is 804310037. The reversal of 804310021 is 120013408.

804310021 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., 667653921 + 136656100 = 25839^2 + 11690^2 .

It is a cyclic number.

It is not a de Polignac number, because 804310021 - 2⁹ = 804309509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804310051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402155010 + 402155011.

It is an arithmetic number, because the mean of its divisors is an integer number (402155011).

Almost surely, 2^804310021 is an apocalyptic number.

It is an amenable number.

804310021 is a deficient number, since it is larger than the sum of its proper divisors (1).

804310021 is an equidigital number, since it uses as much as digits as its factorization.

804310021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 804310021 is about 28360.3600294496. The cubic root of 804310021 is about 929.9818938935.

Adding to 804310021 its reverse (120013408), we get a palindrome (924323429).

The spelling of 804310021 in words is "eight hundred four million, three hundred ten thousand, twenty-one".