17043857221 has 2 divisors, whose sum is σ = 17043857222. Its totient is φ = 17043857220.

The previous prime is 17043857197. The next prime is 17043857251. The reversal of 17043857221 is 12275834071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15008945121 + 2034912100 = 122511^2 + 45110^2 .

It is an emirp because it is prime and its reverse (12275834071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17043857221 - 2¹¹ = 17043855173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17043857251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8521928610 + 8521928611.

It is an arithmetic number, because the mean of its divisors is an integer number (8521928611).

Almost surely, 2^17043857221 is an apocalyptic number.

It is an amenable number.

17043857221 is a deficient number, since it is larger than the sum of its proper divisors (1).

17043857221 is an equidigital number, since it uses as much as digits as its factorization.

17043857221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 17043857221 in words is "seventeen billion, forty-three million, eight hundred fifty-seven thousand, two hundred twenty-one".