217512882850 has 24 divisors (see below), whose sum is σ = 404590603428. Its totient is φ = 87001574400.

The previous prime is 217512882827. The next prime is 217512882857. The reversal of 217512882850 is 58288215712.

It can be written as a sum of positive squares in 6 ways, for example, as 49149559809 + 168363323041 = 221697^2 + 410321^2 .

It is a junction number, because it is equal to n+sod(n) for n = 217512882794 and 217512882803.

It is not an unprimeable number, because it can be changed into a prime (217512882857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1375890 + ... + 1525810.

Almost surely, 2^217512882850 is an apocalyptic number.

217512882850 is a deficient number, since it is larger than the sum of its proper divisors (187077720578).

217512882850 is a wasteful number, since it uses less digits than its factorization.

217512882850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178950 (or 178945 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 49.

The spelling of 217512882850 in words is "two hundred seventeen billion, five hundred twelve million, eight hundred eighty-two thousand, eight hundred fifty".