12221220228 has 48 divisors (see below), whose sum is σ = 32598593664. Its totient is φ = 3490848000.

The previous prime is 12221220173. The next prime is 12221220229. The reversal of 12221220228 is 82202212221.

It is a happy number.

It is a super-2 number, since 2×12221220228² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12221220198 and 12221220207.

It is not an unprimeable number, because it can be changed into a prime (12221220229) 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 15 ways as a sum of consecutive naturals, for example, 336978 + ... + 371478.

It is an arithmetic number, because the mean of its divisors is an integer number (679137368).

Almost surely, 2^12221220228 is an apocalyptic number.

It is an amenable number.

12221220228 is an abundant number, since it is smaller than the sum of its proper divisors (20377373436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221220228 is a wasteful number, since it uses less digits than its factorization.

12221220228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38732 (or 38730 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 12221220228 its reverse (82202212221), we get a palindrome (94423432449).

The spelling of 12221220228 in words is "twelve billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-eight".