8200921 has 2 divisors, whose sum is σ = 8200922. Its totient is φ = 8200920.

The previous prime is 8200883. The next prime is 8200979. The reversal of 8200921 is 1290028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4888521 + 3312400 = 2211^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 8200921 - 2¹⁹ = 7676633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8200892 and 8200901.

It is not a weakly prime, because it can be changed into another prime (8200991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100460 + 4100461.

It is an arithmetic number, because the mean of its divisors is an integer number (4100461).

Almost surely, 2^8200921 is an apocalyptic number.

It is an amenable number.

8200921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8200921 is an equidigital number, since it uses as much as digits as its factorization.

8200921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 8200921 is about 2863.7250217156. The cubic root of 8200921 is about 201.6605169295.

Adding to 8200921 its reverse (1290028), we get a palindrome (9490949).

The spelling of 8200921 in words is "eight million, two hundred thousand, nine hundred twenty-one".