13131031121 has 24 divisors (see below), whose sum is σ = 14700867264. Its totient is φ = 11714414400.

The previous prime is 13131031103. The next prime is 13131031153. The reversal of 13131031121 is 12113013131.

It is a de Polignac number, because none of the positive numbers 2^k-13131031121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13131031121.

It is not an unprimeable number, because it can be changed into a prime (13131031021) 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, 937250 + ... + 951156.

It is an arithmetic number, because the mean of its divisors is an integer number (612536136).

Almost surely, 2^13131031121 is an apocalyptic number.

It is an amenable number.

13131031121 is a deficient number, since it is larger than the sum of its proper divisors (1569836143).

13131031121 is a wasteful number, since it uses less digits than its factorization.

13131031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14121 (or 14108 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 13131031121 its reverse (12113013131), we get a palindrome (25244044252).

The spelling of 13131031121 in words is "thirteen billion, one hundred thirty-one million, thirty-one thousand, one hundred twenty-one".