13216225 has 36 divisors (see below), whose sum is σ = 19147212. Its totient is φ = 9011200.

The previous prime is 13216223. The next prime is 13216241. The reversal of 13216225 is 52261231.

13216225 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 1437601 + 11778624 = 1199^2 + 3432^2 .

It is not a de Polignac number, because 13216225 - 2¹ = 13216223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13216196 and 13216205.

It is not an unprimeable number, because it can be changed into a prime (13216223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 51297 + ... + 51553.

It is an arithmetic number, because the mean of its divisors is an integer number (531867).

Almost surely, 2^13216225 is an apocalyptic number.

It is an amenable number.

13216225 is a deficient number, since it is larger than the sum of its proper divisors (5930987).

13216225 is a wasteful number, since it uses less digits than its factorization.

13216225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 290 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 13216225 is about 3635.4126313254. The cubic root of 13216225 is about 236.4299413902.

Adding to 13216225 its reverse (52261231), we get a palindrome (65477456).

The spelling of 13216225 in words is "thirteen million, two hundred sixteen thousand, two hundred twenty-five".