216170 has 8 divisors (see below), whose sum is σ = 389124. Its totient is φ = 86464.

The previous prime is 216157. The next prime is 216173. The reversal of 216170 is 71612.

It is a happy number.

216170 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 203401 + 12769 = 451^2 + 113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216170.

It is not an unprimeable number, because it can be changed into a prime (216173) by changing a digit.

216170 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10799 + ... + 10818.

2²¹⁶¹⁷⁰ is an apocalyptic number.

216170 is a deficient number, since it is larger than the sum of its proper divisors (172954).

216170 is a wasteful number, since it uses less digits than its factorization.

216170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21624.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 216170 is about 464.9408564538. The cubic root of 216170 is about 60.0157366130.

Subtracting from 216170 its sum of digits (17), we obtain a triangular number (216153 = T₆₅₇).

Adding to 216170 its reverse (71612), we get a palindrome (287782).

The spelling of 216170 in words is "two hundred sixteen thousand, one hundred seventy".