17115244021 has 2 divisors, whose sum is σ = 17115244022. Its totient is φ = 17115244020.

The previous prime is 17115244009. The next prime is 17115244051. The reversal of 17115244021 is 12044251171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8693511121 + 8421732900 = 93239^2 + 91770^2 .

It is a cyclic number.

It is not a de Polignac number, because 17115244021 - 2¹³ = 17115235829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17115244051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8557622010 + 8557622011.

It is an arithmetic number, because the mean of its divisors is an integer number (8557622011).

Almost surely, 2^17115244021 is an apocalyptic number.

It is an amenable number.

17115244021 is a deficient number, since it is larger than the sum of its proper divisors (1).

17115244021 is an equidigital number, since it uses as much as digits as its factorization.

17115244021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 17115244021 its reverse (12044251171), we get a palindrome (29159495192).

The spelling of 17115244021 in words is "seventeen billion, one hundred fifteen million, two hundred forty-four thousand, twenty-one".