21010122201017 has 2 divisors, whose sum is σ = 21010122201018. Its totient is φ = 21010122201016.

The previous prime is 21010122201001. The next prime is 21010122201037. The reversal of 21010122201017 is 71010222101012.

It is a happy number.

It is an a-pointer prime, because the next prime (21010122201037) can be obtained adding 21010122201017 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20885667767056 + 124454433961 = 4570084^2 + 352781^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010122201017 - 2⁴ = 21010122201001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010122201017.

It is not a weakly prime, because it can be changed into another prime (21010122201037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505061100508 + 10505061100509.

It is an arithmetic number, because the mean of its divisors is an integer number (10505061100509).

Almost surely, 2^{21010122201017} is an apocalyptic number.

It is an amenable number.

21010122201017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010122201017 is an equidigital number, since it uses as much as digits as its factorization.

21010122201017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21010122201017 its reverse (71010222101012), we get a palindrome (92020344302029).

The spelling of 21010122201017 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, two hundred one thousand, seventeen".