1331221224 has 32 divisors (see below), whose sum is σ = 3418002720. Its totient is φ = 431747136.

The previous prime is 1331221121. The next prime is 1331221231. The reversal of 1331221224 is 4221221331.

1331221224 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1331221224.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 748674 + ... + 750449.

It is an arithmetic number, because the mean of its divisors is an integer number (106812585).

Almost surely, 2^1331221224 is an apocalyptic number.

It is an amenable number.

1331221224 is an abundant number, since it is smaller than the sum of its proper divisors (2086781496).

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

1331221224 is a wasteful number, since it uses less digits than its factorization.

1331221224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499169 (or 1499165 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 1331221224 is about 36485.9044563788. The cubic root of 1331221224 is about 1100.0609398746.

Adding to 1331221224 its reverse (4221221331), we get a palindrome (5552442555).

The spelling of 1331221224 in words is "one billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty-four".