21210200220017 has 2 divisors, whose sum is σ = 21210200220018. Its totient is φ = 21210200220016.

The previous prime is 21210200219959. The next prime is 21210200220061. The reversal of 21210200220017 is 71002200201212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18943115912161 + 2267084307856 = 4352369^2 + 1505684^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210200220017 - 2⁶ = 21210200219953 is a prime.

It is a super-3 number, since 3×21210200220017³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21210200222017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605100110008 + 10605100110009.

It is an arithmetic number, because the mean of its divisors is an integer number (10605100110009).

Almost surely, 2^{21210200220017} is an apocalyptic number.

It is an amenable number.

21210200220017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210200220017 is an equidigital number, since it uses as much as digits as its factorization.

21210200220017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21210200220017 its reverse (71002200201212), we get a palindrome (92212400421229).

The spelling of 21210200220017 in words is "twenty-one trillion, two hundred ten billion, two hundred million, two hundred twenty thousand, seventeen".