13523435021 has 4 divisors (see below), whose sum is σ = 13524139200. Its totient is φ = 13522730844.

The previous prime is 13523435011. The next prime is 13523435047. The reversal of 13523435021 is 12053432531.

It is a happy number.

13523435021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13523435021 - 2¹⁸ = 13523172877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13523435011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322451 + ... + 361968.

It is an arithmetic number, because the mean of its divisors is an integer number (3381034800).

Almost surely, 2^13523435021 is an apocalyptic number.

It is an amenable number.

13523435021 is a deficient number, since it is larger than the sum of its proper divisors (704179).

13523435021 is an equidigital number, since it uses as much as digits as its factorization.

13523435021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704178.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 13523435021 its reverse (12053432531), we get a palindrome (25576867552).

The spelling of 13523435021 in words is "thirteen billion, five hundred twenty-three million, four hundred thirty-five thousand, twenty-one".