12221128 has 16 divisors (see below), whose sum is σ = 23402880. Its totient is φ = 5980368.

The previous prime is 12221117. The next prime is 12221171. The reversal of 12221128 is 82112221.

It is a nude number because it is divisible by every one of its digits.

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 3 ways as a sum of consecutive naturals, for example, 15876 + ... + 16627.

It is an arithmetic number, because the mean of its divisors is an integer number (1462680).

Almost surely, 2^12221128 is an apocalyptic number.

It is an amenable number.

12221128 is a deficient number, since it is larger than the sum of its proper divisors (11181752).

12221128 is a wasteful number, since it uses less digits than its factorization.

12221128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32556 (or 32552 counting only the distinct ones).

The product of its digits is 128, while the sum is 19.

The square root of 12221128 is about 3495.8729954047. The cubic root of 12221128 is about 230.3405666692.

Adding to 12221128 its reverse (82112221), we get a palindrome (94333349).

The spelling of 12221128 in words is "twelve million, two hundred twenty-one thousand, one hundred twenty-eight".