12221220222 has 40 divisors (see below), whose sum is σ = 28052518032. Its totient is φ = 3974378400.

The previous prime is 12221220173. The next prime is 12221220229. The reversal of 12221220222 is 22202212221.

12221220222 is a `hidden beast` number, since 1 + 2 + 221 + 220 + 222 = 666.

12221220222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12221220195 and 12221220204.

It is a congruent number.

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 (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 913354 + ... + 926637.

Almost surely, 2^12221220222 is an apocalyptic number.

12221220222 is an abundant number, since it is smaller than the sum of its proper divisors (15831297810).

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

12221220222 is a wasteful number, since it uses less digits than its factorization.

12221220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840046 (or 1840037 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 12221220222 its reverse (22202212221), we get a palindrome (34423432443).

The spelling of 12221220222 in words is "twelve billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-two".