221216162 has 12 divisors (see below), whose sum is σ = 346880310. Its totient is φ = 105798528.

The previous prime is 221216153. The next prime is 221216173. The reversal of 221216162 is 261612122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 194909521 + 26306641 = 13961^2 + 5129^2 .

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103487 + ... + 105602.

Almost surely, 2^221216162 is an apocalyptic number.

221216162 is a deficient number, since it is larger than the sum of its proper divisors (125664148).

221216162 is a wasteful number, since it uses less digits than its factorization.

221216162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209137 (or 209114 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 221216162 is about 14873.3372852228. The cubic root of 221216162 is about 604.7914150150.

Adding to 221216162 its reverse (261612122), we get a palindrome (482828284).

The spelling of 221216162 in words is "two hundred twenty-one million, two hundred sixteen thousand, one hundred sixty-two".