13443021523 has 4 divisors (see below), whose sum is σ = 13576120848. Its totient is φ = 13309922200.

The previous prime is 13443021521. The next prime is 13443021551. The reversal of 13443021523 is 32512034431.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13443021523 - 2¹ = 13443021521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13443021491 and 13443021500.

It is not an unprimeable number, because it can be changed into a prime (13443021521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66549511 + ... + 66549712.

It is an arithmetic number, because the mean of its divisors is an integer number (3394030212).

Almost surely, 2^13443021523 is an apocalyptic number.

13443021523 is a deficient number, since it is larger than the sum of its proper divisors (133099325).

13443021523 is a wasteful number, since it uses less digits than its factorization.

13443021523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133099324.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 13443021523 its reverse (32512034431), we get a palindrome (45955055954).

The spelling of 13443021523 in words is "thirteen billion, four hundred forty-three million, twenty-one thousand, five hundred twenty-three".