13128311217 has 16 divisors (see below), whose sum is σ = 21181813632. Its totient is φ = 7060604160.

The previous prime is 13128311201. The next prime is 13128311219. The reversal of 13128311217 is 71211382131.

It is not a de Polignac number, because 13128311217 - 2⁴ = 13128311201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13128311219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18386634 + ... + 18387347.

It is an arithmetic number, because the mean of its divisors is an integer number (1323863352).

Almost surely, 2^13128311217 is an apocalyptic number.

13128311217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13128311217 is a deficient number, since it is larger than the sum of its proper divisors (8053502415).

13128311217 is a wasteful number, since it uses less digits than its factorization.

13128311217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36774008.

The product of its digits is 2016, while the sum is 30.

Adding to 13128311217 its reverse (71211382131), we get a palindrome (84339693348).

The spelling of 13128311217 in words is "thirteen billion, one hundred twenty-eight million, three hundred eleven thousand, two hundred seventeen".