201021102120017 has 2 divisors, whose sum is σ = 201021102120018. Its totient is φ = 201021102120016.

The previous prime is 201021102119939. The next prime is 201021102120089. The reversal of 201021102120017 is 710021201120102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198742212979216 + 2278889140801 = 14097596^2 + 1509599^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021102120017 - 2¹² = 201021102115921 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021102120217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510551060008 + 100510551060009.

It is an arithmetic number, because the mean of its divisors is an integer number (100510551060009).

Almost surely, 2^{201021102120017} is an apocalyptic number.

It is an amenable number.

201021102120017 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021102120017 is an equidigital number, since it uses as much as digits as its factorization.

201021102120017 is an odious number, because the sum of its binary digits is odd.

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

Adding to 201021102120017 its reverse (710021201120102), we get a palindrome (911042303240119).

The spelling of 201021102120017 in words is "two hundred one trillion, twenty-one billion, one hundred two million, one hundred twenty thousand, seventeen".