13131031311121 has 4 divisors (see below), whose sum is σ = 13378786618932. Its totient is φ = 12883276003312.

The previous prime is 13131031311049. The next prime is 13131031311133. The reversal of 13131031311121 is 12111313013131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8685516294400 + 4445515016721 = 2947120^2 + 2108439^2 .

It is a cyclic number.

It is not a de Polignac number, because 13131031311121 - 2¹⁹ = 13131030786833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13131031311092 and 13131031311101.

It is not an unprimeable number, because it can be changed into a prime (13131031311161) 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, 123877653826 + ... + 123877653931.

It is an arithmetic number, because the mean of its divisors is an integer number (3344696654733).

Almost surely, 2^{13131031311121} is an apocalyptic number.

It is an amenable number.

13131031311121 is a deficient number, since it is larger than the sum of its proper divisors (247755307811).

13131031311121 is an equidigital number, since it uses as much as digits as its factorization.

13131031311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247755307810.

The product of its (nonzero) digits is 162, while the sum is 22.

Adding to 13131031311121 its reverse (12111313013131), we get a palindrome (25242344324252).

The spelling of 13131031311121 in words is "thirteen trillion, one hundred thirty-one billion, thirty-one million, three hundred eleven thousand, one hundred twenty-one".