217730241 has 16 divisors (see below), whose sum is σ = 326649600. Its totient is φ = 143314704.

The previous prime is 217730239. The next prime is 217730263. The reversal of 217730241 is 142037712.

It is a happy number.

217730241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217730241 - 2¹ = 217730239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (217730221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48906 + ... + 53171.

It is an arithmetic number, because the mean of its divisors is an integer number (20415600).

Almost surely, 2^217730241 is an apocalyptic number.

It is an amenable number.

217730241 is a deficient number, since it is larger than the sum of its proper divisors (108919359).

217730241 is a wasteful number, since it uses less digits than its factorization.

217730241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102165 (or 102159 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 217730241 is about 14755.6850400109. The cubic root of 217730241 is about 601.5978161953.

Adding to 217730241 its reverse (142037712), we get a palindrome (359767953).

The spelling of 217730241 in words is "two hundred seventeen million, seven hundred thirty thousand, two hundred forty-one".