217728345271 has 2 divisors, whose sum is σ = 217728345272. Its totient is φ = 217728345270.

The previous prime is 217728345259. The next prime is 217728345277. The reversal of 217728345271 is 172543827712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217728345271 - 2⁹ = 217728344759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217728345277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108864172635 + 108864172636.

It is an arithmetic number, because the mean of its divisors is an integer number (108864172636).

Almost surely, 2^217728345271 is an apocalyptic number.

217728345271 is a deficient number, since it is larger than the sum of its proper divisors (1).

217728345271 is an equidigital number, since it uses as much as digits as its factorization.

217728345271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1317120, while the sum is 49.

The spelling of 217728345271 in words is "two hundred seventeen billion, seven hundred twenty-eight million, three hundred forty-five thousand, two hundred seventy-one".