217030206247 has 2 divisors, whose sum is σ = 217030206248. Its totient is φ = 217030206246.

The previous prime is 217030206221. The next prime is 217030206311. The reversal of 217030206247 is 742602030712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217030206247 - 2¹⁹ = 217029681959 is a prime.

It is a super-2 number, since 2×217030206247² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217030006247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108515103123 + 108515103124.

It is an arithmetic number, because the mean of its divisors is an integer number (108515103124).

Almost surely, 2^217030206247 is an apocalyptic number.

217030206247 is a deficient number, since it is larger than the sum of its proper divisors (1).

217030206247 is an equidigital number, since it uses as much as digits as its factorization.

217030206247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 34.

Adding to 217030206247 its reverse (742602030712), we get a palindrome (959632236959).

The spelling of 217030206247 in words is "two hundred seventeen billion, thirty million, two hundred six thousand, two hundred forty-seven".