13443521 has 16 divisors (see below), whose sum is σ = 16727424. Its totient is φ = 10520064.

The previous prime is 13443517. The next prime is 13443527. The reversal of 13443521 is 12534431.

It is a cyclic number.

It is not a de Polignac number, because 13443521 - 2² = 13443517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13443527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8066 + ... + 9588.

It is an arithmetic number, because the mean of its divisors is an integer number (1045464).

Almost surely, 2^13443521 is an apocalyptic number.

It is an amenable number.

13443521 is a deficient number, since it is larger than the sum of its proper divisors (3283903).

13443521 is a wasteful number, since it uses less digits than its factorization.

13443521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640.

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

The square root of 13443521 is about 3666.5407402619. The cubic root of 13443521 is about 237.7776387473. Note that the first 3 decimals are identical.

Adding to 13443521 its reverse (12534431), we get a palindrome (25977952).

The spelling of 13443521 in words is "thirteen million, four hundred forty-three thousand, five hundred twenty-one".