12210121228 has 12 divisors (see below), whose sum is σ = 22296743280. Its totient is φ = 5839623152.

The previous prime is 12210121199. The next prime is 12210121229. The reversal of 12210121228 is 82212101221.

It is a junction number, because it is equal to n+sod(n) for n = 12210121199 and 12210121208.

It is not an unprimeable number, because it can be changed into a prime (12210121229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66359263 + ... + 66359446.

It is an arithmetic number, because the mean of its divisors is an integer number (1858061940).

Almost surely, 2^12210121228 is an apocalyptic number.

It is an amenable number.

12210121228 is a deficient number, since it is larger than the sum of its proper divisors (10086622052).

12210121228 is a wasteful number, since it uses less digits than its factorization.

12210121228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132718736 (or 132718734 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 12210121228 its reverse (82212101221), we get a palindrome (94422222449).

The spelling of 12210121228 in words is "twelve billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-eight".