8305021 has 2 divisors, whose sum is σ = 8305022. Its totient is φ = 8305020.

The previous prime is 8305009. The next prime is 8305039. The reversal of 8305021 is 1205038.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 68121 = 2870^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 8305021 - 2²¹ = 6207869 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8305021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8305051) 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, 4152510 + 4152511.

It is an arithmetic number, because the mean of its divisors is an integer number (4152511).

Almost surely, 2^8305021 is an apocalyptic number.

It is an amenable number.

8305021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8305021 is an equidigital number, since it uses as much as digits as its factorization.

8305021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 8305021 is about 2881.8433337015. The cubic root of 8305021 is about 202.5102042310.

The spelling of 8305021 in words is "eight million, three hundred five thousand, twenty-one".