13521447 has 24 divisors (see below), whose sum is σ = 20651904. Its totient is φ = 8507664.

The previous prime is 13521437. The next prime is 13521449. The reversal of 13521447 is 74412531.

13521447 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13521447 - 2²³ = 5132839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13521447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16788 + ... + 17574.

It is an arithmetic number, because the mean of its divisors is an integer number (860496).

Almost surely, 2^13521447 is an apocalyptic number.

13521447 is a deficient number, since it is larger than the sum of its proper divisors (7130457).

13521447 is a wasteful number, since it uses less digits than its factorization.

13521447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 896 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 13521447 is about 3677.1520229656. The cubic root of 13521447 is about 238.2361836380.

Adding to 13521447 its reverse (74412531), we get a palindrome (87933978).

The spelling of 13521447 in words is "thirteen million, five hundred twenty-one thousand, four hundred forty-seven".