216305222 has 16 divisors (see below), whose sum is σ = 379433472. Its totient is φ = 90546120.

The previous prime is 216305213. The next prime is 216305227. The reversal of 216305222 is 222503612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216305227) 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, 179054 + ... + 180257.

It is an arithmetic number, because the mean of its divisors is an integer number (23714592).

Almost surely, 2^216305222 is an apocalyptic number.

216305222 is a deficient number, since it is larger than the sum of its proper divisors (163128250).

216305222 is a wasteful number, since it uses less digits than its factorization.

216305222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359363.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 216305222 is about 14707.3186543299. The cubic root of 216305222 is about 600.2824799506.

Adding to 216305222 its reverse (222503612), we get a palindrome (438808834).

The spelling of 216305222 in words is "two hundred sixteen million, three hundred five thousand, two hundred twenty-two".