13507013521 has 4 divisors (see below), whose sum is σ = 13511347200. Its totient is φ = 13502679844.

The previous prime is 13507013491. The next prime is 13507013537. The reversal of 13507013521 is 12531070531.

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: 12531070531 = 7 ⋅1790152933.

It is a cyclic number.

It is not a de Polignac number, because 13507013521 - 2⁵ = 13507013489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13507013521.

It is not an unprimeable number, because it can be changed into a prime (13507013591) 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, 2162161 + ... + 2168398.

It is an arithmetic number, because the mean of its divisors is an integer number (3377836800).

Almost surely, 2^13507013521 is an apocalyptic number.

It is an amenable number.

13507013521 is a deficient number, since it is larger than the sum of its proper divisors (4333679).

13507013521 is an equidigital number, since it uses as much as digits as its factorization.

13507013521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4333678.

The product of its (nonzero) digits is 3150, while the sum is 28.

The spelling of 13507013521 in words is "thirteen billion, five hundred seven million, thirteen thousand, five hundred twenty-one".