12221121224 has 32 divisors (see below), whose sum is σ = 24690792000. Its totient is φ = 5637425472.

The previous prime is 12221121221. The next prime is 12221121239. The reversal of 12221121224 is 42212112221.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 12221121196 and 12221121205.

It is not an unprimeable number, because it can be changed into a prime (12221121221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164147 + ... + 226685.

It is an arithmetic number, because the mean of its divisors is an integer number (771587250).

Almost surely, 2^12221121224 is an apocalyptic number.

It is an amenable number.

12221121224 is an abundant number, since it is smaller than the sum of its proper divisors (12469670776).

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

12221121224 is a wasteful number, since it uses less digits than its factorization.

12221121224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64437 (or 64433 counting only the distinct ones).

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

Adding to 12221121224 its reverse (42212112221), we get a palindrome (54433233445).

The spelling of 12221121224 in words is "twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-four".