21002210017 has 2 divisors, whose sum is σ = 21002210018. Its totient is φ = 21002210016.

The previous prime is 21002210003. The next prime is 21002210039. The reversal of 21002210017 is 71001220012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20347310736 + 654899281 = 142644^2 + 25591^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002210017 - 2⁷ = 21002209889 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002210077) 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, 10501105008 + 10501105009.

It is an arithmetic number, because the mean of its divisors is an integer number (10501105009).

Almost surely, 2^21002210017 is an apocalyptic number.

It is an amenable number.

21002210017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002210017 is an equidigital number, since it uses as much as digits as its factorization.

21002210017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 21002210017 its reverse (71001220012), we get a palindrome (92003430029).

The spelling of 21002210017 in words is "twenty-one billion, two million, two hundred ten thousand, seventeen".