218321016 has 64 divisors (see below), whose sum is σ = 572590080. Its totient is φ = 69287040.

The previous prime is 218321009. The next prime is 218321017. The reversal of 218321016 is 610123812.

218321016 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218321017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39121 + ... + 44351.

It is an arithmetic number, because the mean of its divisors is an integer number (8946720).

Almost surely, 2^218321016 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 218321016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286295040).

218321016 is an abundant number, since it is smaller than the sum of its proper divisors (354269064).

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

218321016 is a wasteful number, since it uses less digits than its factorization.

218321016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324 (or 5320 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 218321016 is about 14775.6900346481. The cubic root of 218321016 is about 602.1414368764.

Adding to 218321016 its reverse (610123812), we get a palindrome (828444828).

The spelling of 218321016 in words is "two hundred eighteen million, three hundred twenty-one thousand, sixteen".