2101021717 has 2 divisors, whose sum is σ = 2101021718. Its totient is φ = 2101021716.

The previous prime is 2101021709. The next prime is 2101021751. The reversal of 2101021717 is 7171201012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1954877796 + 146143921 = 44214^2 + 12089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101021717 - 2³ = 2101021709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101021217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050510858 + 1050510859.

It is an arithmetic number, because the mean of its divisors is an integer number (1050510859).

Almost surely, 2^2101021717 is an apocalyptic number.

It is an amenable number.

2101021717 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101021717 is an equidigital number, since it uses as much as digits as its factorization.

2101021717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 22.

The square root of 2101021717 is about 45836.9034403503. The cubic root of 2101021717 is about 1280.7868121889.

Adding to 2101021717 its reverse (7171201012), we get a palindrome (9272222729).

The spelling of 2101021717 in words is "two billion, one hundred one million, twenty-one thousand, seven hundred seventeen".