17118406621 has 2 divisors, whose sum is σ = 17118406622. Its totient is φ = 17118406620.

The previous prime is 17118406619. The next prime is 17118406667. The reversal of 17118406621 is 12660481171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13420064025 + 3698342596 = 115845^2 + 60814^2 .

It is a cyclic number.

It is not a de Polignac number, because 17118406621 - 2¹ = 17118406619 is a prime.

Together with 17118406619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17118406691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8559203310 + 8559203311.

It is an arithmetic number, because the mean of its divisors is an integer number (8559203311).

Almost surely, 2^17118406621 is an apocalyptic number.

It is an amenable number.

17118406621 is a deficient number, since it is larger than the sum of its proper divisors (1).

17118406621 is an equidigital number, since it uses as much as digits as its factorization.

17118406621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

Adding to 17118406621 its reverse (12660481171), we get a palindrome (29778887792).

The spelling of 17118406621 in words is "seventeen billion, one hundred eighteen million, four hundred six thousand, six hundred twenty-one".