13004440521 has 4 divisors (see below), whose sum is σ = 17339254032. Its totient is φ = 8669627012.

The previous prime is 13004440517. The next prime is 13004440543. The reversal of 13004440521 is 12504440031.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12504440031 = 3 ⋅4168146677.

It is a cyclic number.

It is not a de Polignac number, because 13004440521 - 2² = 13004440517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13004440491 and 13004440500.

It is not an unprimeable number, because it can be changed into a prime (13004440591) 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, 2167406751 + ... + 2167406756.

It is an arithmetic number, because the mean of its divisors is an integer number (4334813508).

Almost surely, 2^13004440521 is an apocalyptic number.

It is an amenable number.

13004440521 is a deficient number, since it is larger than the sum of its proper divisors (4334813511).

13004440521 is an equidigital number, since it uses as much as digits as its factorization.

13004440521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334813510.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 13004440521 its reverse (12504440031), we get a palindrome (25508880552).

The spelling of 13004440521 in words is "thirteen billion, four million, four hundred forty thousand, five hundred twenty-one".