1223221312 has 56 divisors (see below), whose sum is σ = 2516428800. Its totient is φ = 589332480.

The previous prime is 1223221309. The next prime is 1223221319. The reversal of 1223221312 is 2131223221.

It is a self number, because there is not a number n which added to its sum of digits gives 1223221312.

It is not an unprimeable number, because it can be changed into a prime (1223221319) 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, 508689 + ... + 511087.

Almost surely, 2^1223221312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1258214400).

1223221312 is an abundant number, since it is smaller than the sum of its proper divisors (1293207488).

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

1223221312 is a wasteful number, since it uses less digits than its factorization.

1223221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699 (or 2689 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 1223221312 is about 34974.5809410206. The cubic root of 1223221312 is about 1069.4693592683.

Adding to 1223221312 its reverse (2131223221), we get a palindrome (3354444533).

The spelling of 1223221312 in words is "one billion, two hundred twenty-three million, two hundred twenty-one thousand, three hundred twelve".