13111425521 has 4 divisors (see below), whose sum is σ = 13145659392. Its totient is φ = 13077191652.

The previous prime is 13111425499. The next prime is 13111425533. The reversal of 13111425521 is 12552411131.

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 a de Polignac number, because none of the positive numbers 2^k-13111425521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13111425581) 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, 17116361 + ... + 17117126.

It is an arithmetic number, because the mean of its divisors is an integer number (3286414848).

Almost surely, 2^13111425521 is an apocalyptic number.

It is an amenable number.

13111425521 is a deficient number, since it is larger than the sum of its proper divisors (34233871).

13111425521 is an equidigital number, since it uses as much as digits as its factorization.

13111425521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34233870.

The product of its digits is 1200, while the sum is 26.

Adding to 13111425521 its reverse (12552411131), we get a palindrome (25663836652).

The spelling of 13111425521 in words is "thirteen billion, one hundred eleven million, four hundred twenty-five thousand, five hundred twenty-one".