13221568 has 56 divisors (see below), whose sum is σ = 28163520. Its totient is φ = 6140160.

The previous prime is 13221553. The next prime is 13221577. The reversal of 13221568 is 86512231.

13221568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

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, 100863 + ... + 100993.

It is an arithmetic number, because the mean of its divisors is an integer number (502920).

Almost surely, 2^13221568 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 13221568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14081760).

13221568 is an abundant number, since it is smaller than the sum of its proper divisors (14941952).

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

13221568 is a wasteful number, since it uses less digits than its factorization.

13221568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 235 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 13221568 is about 3636.1474117533. The cubic root of 13221568 is about 236.4617980659.

Adding to 13221568 its reverse (86512231), we get a palindrome (99733799).

The spelling of 13221568 in words is "thirteen million, two hundred twenty-one thousand, five hundred sixty-eight".