216220 has 24 divisors (see below), whose sum is σ = 478800. Its totient is φ = 81792.

The previous prime is 216217. The next prime is 216233. The reversal of 216220 is 22612.

It is a happy number.

216220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 216220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96 + ... + 664.

It is an arithmetic number, because the mean of its divisors is an integer number (19950).

2²¹⁶²²⁰ is an apocalyptic number.

216220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239400).

216220 is an abundant number, since it is smaller than the sum of its proper divisors (262580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216220 is a wasteful number, since it uses less digits than its factorization.

216220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 216220 is about 464.9946236248. The cubic root of 216220 is about 60.0203634584.

Adding to 216220 its reverse (22612), we get a palindrome (238832).

It can be divided in two parts, 21 and 6220, that added together give a square (6241 = 79²).

The spelling of 216220 in words is "two hundred sixteen thousand, two hundred twenty".