217913910247 has 24 divisors (see below), whose sum is σ = 243150387200. Its totient is φ = 195127788240.

The previous prime is 217913910107. The next prime is 217913910259. The reversal of 217913910247 is 742019319712.

It is not a de Polignac number, because 217913910247 - 2¹⁹ = 217913385959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217913910197 and 217913910206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217913910047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2085004 + ... + 2187022.

Almost surely, 2^217913910247 is an apocalyptic number.

217913910247 is a deficient number, since it is larger than the sum of its proper divisors (25236476953).

217913910247 is a wasteful number, since it uses less digits than its factorization.

217913910247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102307 (or 102296 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 46.

The spelling of 217913910247 in words is "two hundred seventeen billion, nine hundred thirteen million, nine hundred ten thousand, two hundred forty-seven".