8905021 has 2 divisors, whose sum is σ = 8905022. Its totient is φ = 8905020.

The previous prime is 8905009. The next prime is 8905031. The reversal of 8905021 is 1205098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8468100 + 436921 = 2910^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 8905021 - 2⁵ = 8904989 is a prime.

8905021 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8905031) 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, 4452510 + 4452511.

It is an arithmetic number, because the mean of its divisors is an integer number (4452511).

Almost surely, 2^8905021 is an apocalyptic number.

It is an amenable number.

8905021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8905021 is an equidigital number, since it uses as much as digits as its factorization.

8905021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 8905021 is about 2984.1281808930. The cubic root of 8905021 is about 207.2740735465.

The spelling of 8905021 in words is "eight million, nine hundred five thousand, twenty-one".