13521443 has 24 divisors (see below), whose sum is σ = 15988560. Its totient is φ = 11358720.

The previous prime is 13521437. The next prime is 13521449. The reversal of 13521443 is 34412531.

It is an interprime number because it is at equal distance from previous prime (13521437) and next prime (13521449).

It is not a de Polignac number, because 13521443 - 2¹⁴ = 13505059 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221633 + ... + 221693.

It is an arithmetic number, because the mean of its divisors is an integer number (666190).

Almost surely, 2^13521443 is an apocalyptic number.

13521443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13521443 is a deficient number, since it is larger than the sum of its proper divisors (2467117).

13521443 is a wasteful number, since it uses less digits than its factorization.

13521443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 150 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 13521443 is about 3677.1514790664. The cubic root of 13521443 is about 238.2361601458.

Adding to 13521443 its reverse (34412531), we get a palindrome (47933974).

The spelling of 13521443 in words is "thirteen million, five hundred twenty-one thousand, four hundred forty-three".