13221425 has 36 divisors (see below), whose sum is σ = 19592496. Its totient is φ = 8820000.

The previous prime is 13221421. The next prime is 13221431. The reversal of 13221425 is 52412231.

It is not a de Polignac number, because 13221425 - 2² = 13221421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13221397 and 13221406.

It is not an unprimeable number, because it can be changed into a prime (13221421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 52550 + ... + 52800.

It is an arithmetic number, because the mean of its divisors is an integer number (544236).

Almost surely, 2^13221425 is an apocalyptic number.

It is an amenable number.

13221425 is a deficient number, since it is larger than the sum of its proper divisors (6371071).

13221425 is a wasteful number, since it uses less digits than its factorization.

13221425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 306 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 13221425 is about 3636.1277480309. The cubic root of 13221425 is about 236.4609455660.

Adding to 13221425 its reverse (52412231), we get a palindrome (65633656).

The spelling of 13221425 in words is "thirteen million, two hundred twenty-one thousand, four hundred twenty-five".