13443103521 has 40 divisors (see below), whose sum is σ = 20195856384. Its totient is φ = 8911296000.

The previous prime is 13443103489. The next prime is 13443103591. The reversal of 13443103521 is 12530134431.

It is a happy number.

13443103521 is a `hidden beast` number, since 1 + 34 + 4 + 3 + 103 + 521 = 666.

It is not a de Polignac number, because 13443103521 - 2⁵ = 13443103489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13443103591) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17899896 + ... + 17900646.

Almost surely, 2^13443103521 is an apocalyptic number.

It is an amenable number.

13443103521 is a deficient number, since it is larger than the sum of its proper divisors (6752752863).

13443103521 is an equidigital number, since it uses as much as digits as its factorization.

13443103521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723 (or 1714 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 13443103521 its reverse (12530134431), we get a palindrome (25973237952).

It can be divided in two parts, 13443 and 103521, that added together give a square (116964 = 342²).

The spelling of 13443103521 in words is "thirteen billion, four hundred forty-three million, one hundred three thousand, five hundred twenty-one".