217532070730 has 32 divisors (see below), whose sum is σ = 426415525200. Its totient is φ = 79417062912.

The previous prime is 217532070709. The next prime is 217532070731. The reversal of 217532070730 is 37070235712.

It can be written as a sum of positive squares in 8 ways, for example, as 49899964689 + 167632106041 = 223383^2 + 409429^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 217532070730.

It is not an unprimeable number, because it can be changed into a prime (217532070731) 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 15 ways as a sum of consecutive naturals, for example, 9389125 + ... + 9412264.

Almost surely, 2^217532070730 is an apocalyptic number.

217532070730 is a deficient number, since it is larger than the sum of its proper divisors (208883454470).

217532070730 is a wasteful number, since it uses less digits than its factorization.

217532070730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18801498.

The product of its (nonzero) digits is 61740, while the sum is 37.

The spelling of 217532070730 in words is "two hundred seventeen billion, five hundred thirty-two million, seventy thousand, seven hundred thirty".