13221333320 has 64 divisors (see below), whose sum is σ = 32176494000. Its totient is φ = 4860361728.

The previous prime is 13221333233. The next prime is 13221333361. The reversal of 13221333320 is 2333312231.

It can be written as a sum of positive squares in 8 ways, for example, as 3272068804 + 9949264516 = 57202^2 + 99746^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63566 + ... + 174594.

Almost surely, 2^13221333320 is an apocalyptic number.

13221333320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13221333320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16088247000).

13221333320 is an abundant number, since it is smaller than the sum of its proper divisors (18955160680).

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

13221333320 is a wasteful number, since it uses less digits than its factorization.

13221333320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111282 (or 111278 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 13221333320 its reverse (2333312231), we get a palindrome (15554645551).

The spelling of 13221333320 in words is "thirteen billion, two hundred twenty-one million, three hundred thirty-three thousand, three hundred twenty".