216355 has 4 divisors (see below), whose sum is σ = 259632. Its totient is φ = 173080.

The previous prime is 216347. The next prime is 216371. The reversal of 216355 is 553612.

It is a happy number.

216355 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 is not a de Polignac number, because 216355 - 2³ = 216347 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

216355 is a lucky number.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21631 + ... + 21640.

It is an arithmetic number, because the mean of its divisors is an integer number (64908).

2²¹⁶³⁵⁵ is an apocalyptic number.

216355 is a deficient number, since it is larger than the sum of its proper divisors (43277).

216355 is an equidigital number, since it uses as much as digits as its factorization.

216355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43276.

The product of its digits is 900, while the sum is 22.

The square root of 216355 is about 465.1397639420. The cubic root of 216355 is about 60.0328523791.

Adding to 216355 its reverse (553612), we get a palindrome (769967).

The spelling of 216355 in words is "two hundred sixteen thousand, three hundred fifty-five".