13221025 has 12 divisors (see below), whose sum is σ = 16838332. Its totient is φ = 10290240.

The previous prime is 13221011. The next prime is 13221029. The reversal of 13221025 is 52012231.

13221025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 992016 + 12229009 = 996^2 + 3497^2 .

It is not a de Polignac number, because 13221025 - 2⁵ = 13220993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13221029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6222 + ... + 8071.

Almost surely, 2^13221025 is an apocalyptic number.

It is an amenable number.

13221025 is a deficient number, since it is larger than the sum of its proper divisors (3617307).

13221025 is a wasteful number, since it uses less digits than its factorization.

13221025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14340 (or 14335 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 13221025 is about 3636.0727440468. The cubic root of 13221025 is about 236.4585609180.

Adding to 13221025 its reverse (52012231), we get a palindrome (65233256).

The spelling of 13221025 in words is "thirteen million, two hundred twenty-one thousand, twenty-five".