12221228 has 12 divisors (see below), whose sum is σ = 21738192. Its totient is φ = 6010320.

The previous prime is 12221207. The next prime is 12221233. The reversal of 12221228 is 82212221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24800 + ... + 25287.

It is an arithmetic number, because the mean of its divisors is an integer number (1811516).

Almost surely, 2^12221228 is an apocalyptic number.

It is an amenable number.

12221228 is a deficient number, since it is larger than the sum of its proper divisors (9516964).

12221228 is a wasteful number, since it uses less digits than its factorization.

12221228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50152 (or 50150 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

The square root of 12221228 is about 3495.8872979546. The cubic root of 12221228 is about 230.3411949252.

Adding to 12221228 its reverse (82212221), we get a palindrome (94433449).

The spelling of 12221228 in words is "twelve million, two hundred twenty-one thousand, two hundred twenty-eight".