13105503521 has 4 divisors (see below), whose sum is σ = 14296912944. Its totient is φ = 11914094100.

The previous prime is 13105503469. The next prime is 13105503527. The reversal of 13105503521 is 12530550131.

It is a happy number.

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 13105503521 - 2⁶ = 13105503457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13105503527) 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, 595704695 + ... + 595704716.

It is an arithmetic number, because the mean of its divisors is an integer number (3574228236).

Almost surely, 2^13105503521 is an apocalyptic number.

13105503521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13105503521 is a deficient number, since it is larger than the sum of its proper divisors (1191409423).

13105503521 is a wasteful number, since it uses less digits than its factorization.

13105503521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191409422.

The product of its (nonzero) digits is 2250, while the sum is 26.

The spelling of 13105503521 in words is "thirteen billion, one hundred five million, five hundred three thousand, five hundred twenty-one".