13504430021 has 4 divisors (see below), whose sum is σ = 13510099392. Its totient is φ = 13498760652.

The previous prime is 13504430011. The next prime is 13504430057. The reversal of 13504430021 is 12003440531.

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 13504430021 - 2⁶ = 13504429957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13504430011) 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, 2831111 + ... + 2835876.

It is an arithmetic number, because the mean of its divisors is an integer number (3377524848).

Almost surely, 2^13504430021 is an apocalyptic number.

It is an amenable number.

13504430021 is a deficient number, since it is larger than the sum of its proper divisors (5669371).

13504430021 is an equidigital number, since it uses as much as digits as its factorization.

13504430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5669370.

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

Adding to 13504430021 its reverse (12003440531), we get a palindrome (25507870552).

The spelling of 13504430021 in words is "thirteen billion, five hundred four million, four hundred thirty thousand, twenty-one".