221422216 has 8 divisors (see below), whose sum is σ = 415166670. Its totient is φ = 110711104.

The previous prime is 221422211. The next prime is 221422237. The reversal of 221422216 is 612224122.

It can be written as a sum of positive squares in only one way, i.e., 214505316 + 6916900 = 14646^2 + 2630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (221422211) 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 as a sum of consecutive naturals, namely, 13838881 + ... + 13838896.

Almost surely, 2^221422216 is an apocalyptic number.

It is an amenable number.

221422216 is a deficient number, since it is larger than the sum of its proper divisors (193744454).

221422216 is a wasteful number, since it uses less digits than its factorization.

221422216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27677783 (or 27677779 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 221422216 is about 14880.2626320909. The cubic root of 221422216 is about 604.9791364069.

Adding to 221422216 its reverse (612224122), we get a palindrome (833646338).

The spelling of 221422216 in words is "two hundred twenty-one million, four hundred twenty-two thousand, two hundred sixteen".