13121315515 has 64 divisors (see below), whose sum is σ = 19988840448. Its totient is φ = 8031744000.

The previous prime is 13121315503. The next prime is 13121315527. The reversal of 13121315515 is 51551312131.

It is an interprime number because it is at equal distance from previous prime (13121315503) and next prime (13121315527).

It is not a de Polignac number, because 13121315515 - 2⁵ = 13121315483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4937067 + ... + 4939723.

It is an arithmetic number, because the mean of its divisors is an integer number (312325632).

Almost surely, 2^13121315515 is an apocalyptic number.

13121315515 is a deficient number, since it is larger than the sum of its proper divisors (6867524933).

13121315515 is a wasteful number, since it uses less digits than its factorization.

13121315515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908.

The product of its digits is 2250, while the sum is 28.

Adding to 13121315515 its reverse (51551312131), we get a palindrome (64672627646).

The spelling of 13121315515 in words is "thirteen billion, one hundred twenty-one million, three hundred fifteen thousand, five hundred fifteen".