17517411421 has 2 divisors, whose sum is σ = 17517411422. Its totient is φ = 17517411420.

The previous prime is 17517411413. The next prime is 17517411427. The reversal of 17517411421 is 12411471571.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14493511321 + 3023900100 = 120389^2 + 54990^2 .

It is a cyclic number.

It is not a de Polignac number, because 17517411421 - 2³ = 17517411413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17517411427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8758705710 + 8758705711.

It is an arithmetic number, because the mean of its divisors is an integer number (8758705711).

Almost surely, 2^17517411421 is an apocalyptic number.

It is an amenable number.

17517411421 is a deficient number, since it is larger than the sum of its proper divisors (1).

17517411421 is an equidigital number, since it uses as much as digits as its factorization.

17517411421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 34.

Adding to 17517411421 its reverse (12411471571), we get a palindrome (29928882992).

The spelling of 17517411421 in words is "seventeen billion, five hundred seventeen million, four hundred eleven thousand, four hundred twenty-one".