566920021 has 2 divisors, whose sum is σ = 566920022. Its totient is φ = 566920020.

The previous prime is 566920001. The next prime is 566920049. The reversal of 566920021 is 120029665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521208900 + 45711121 = 22830^2 + 6761^2 .

It is a cyclic number.

It is not a de Polignac number, because 566920021 - 2¹¹ = 566917973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566920001) 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, 283460010 + 283460011.

It is an arithmetic number, because the mean of its divisors is an integer number (283460011).

Almost surely, 2^566920021 is an apocalyptic number.

It is an amenable number.

566920021 is a deficient number, since it is larger than the sum of its proper divisors (1).

566920021 is an equidigital number, since it uses as much as digits as its factorization.

566920021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 566920021 is about 23810.0823392108. The cubic root of 566920021 is about 827.6383346829.

Adding to 566920021 its reverse (120029665), we get a palindrome (686949686).

The spelling of 566920021 in words is "five hundred sixty-six million, nine hundred twenty thousand, twenty-one".