18210216 has 32 divisors (see below), whose sum is σ = 46758240. Its totient is φ = 5905728.

The previous prime is 18210209. The next prime is 18210239. The reversal of 18210216 is 61201281.

It is a super-2 number, since 2×18210216² = 663223933533312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18210192 and 18210201.

It is an unprimeable number.

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, 9366 + ... + 11141.

It is an arithmetic number, because the mean of its divisors is an integer number (1461195).

Almost surely, 2^18210216 is an apocalyptic number.

It is an amenable number.

18210216 is an abundant number, since it is smaller than the sum of its proper divisors (28548024).

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

18210216 is a wasteful number, since it uses less digits than its factorization.

18210216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20553 (or 20549 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 18210216 is about 4267.3429672338. The cubic root of 18210216 is about 263.0904188713.

Adding to 18210216 its reverse (61201281), we get a palindrome (79411497).

The spelling of 18210216 in words is "eighteen million, two hundred ten thousand, two hundred sixteen".