216229 has 4 divisors (see below), whose sum is σ = 232876. Its totient is φ = 199584.

The previous prime is 216217. The next prime is 216233. The reversal of 216229 is 922612.

It is a happy number.

216229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31329 + 184900 = 177^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 216229 - 2¹³ = 208037 is a prime.

It is a Duffinian number.

216229 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8304 + ... + 8329.

It is an arithmetic number, because the mean of its divisors is an integer number (58219).

2²¹⁶²²⁹ is an apocalyptic number.

It is an amenable number.

216229 is a deficient number, since it is larger than the sum of its proper divisors (16647).

216229 is a wasteful number, since it uses less digits than its factorization.

216229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16646.

The product of its digits is 432, while the sum is 22.

The square root of 216229 is about 465.0043010554. The cubic root of 216229 is about 60.0211962148.

The spelling of 216229 in words is "two hundred sixteen thousand, two hundred twenty-nine".