216443216 has 40 divisors (see below), whose sum is σ = 463952448. Its totient is φ = 96992000.

The previous prime is 216443207. The next prime is 216443219. The reversal of 216443216 is 612344612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216443219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3836 + ... + 21156.

Almost surely, 2^216443216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216443216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231976224).

216443216 is an abundant number, since it is smaller than the sum of its proper divisors (247509232).

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

216443216 is a wasteful number, since it uses less digits than its factorization.

216443216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17411 (or 17405 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 216443216 is about 14712.0092441515. The cubic root of 216443216 is about 600.4101048114.

Adding to 216443216 its reverse (612344612), we get a palindrome (828787828).

The spelling of 216443216 in words is "two hundred sixteen million, four hundred forty-three thousand, two hundred sixteen".