13115134515521 has 24 divisors (see below), whose sum is σ = 14666029493280. Its totient is φ = 11693373898752.

The previous prime is 13115134515499. The next prime is 13115134515523. The reversal of 13115134515521 is 12551543151131.

It is a de Polignac number, because none of the positive numbers 2^k-13115134515521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13115134515523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127872566 + ... + 127975088.

It is an arithmetic number, because the mean of its divisors is an integer number (611084562220).

Almost surely, 2^{13115134515521} is an apocalyptic number.

It is an amenable number.

13115134515521 is a deficient number, since it is larger than the sum of its proper divisors (1550894977759).

13115134515521 is a wasteful number, since it uses less digits than its factorization.

13115134515521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125873 (or 125856 counting only the distinct ones).

The product of its digits is 45000, while the sum is 38.

Adding to 13115134515521 its reverse (12551543151131), we get a palindrome (25666677666652).

The spelling of 13115134515521 in words is "thirteen trillion, one hundred fifteen billion, one hundred thirty-four million, five hundred fifteen thousand, five hundred twenty-one".