13120131031321 has 4 divisors (see below), whose sum is σ = 13120307193700. Its totient is φ = 13119954868944.

The previous prime is 13120131031307. The next prime is 13120131031327. The reversal of 13120131031321 is 12313013102131.

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 6802649859721 + 6317481171600 = 2608189^2 + 2513460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13120131031321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13120131031292 and 13120131031301.

It is not an unprimeable number, because it can be changed into a prime (13120131031327) 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, 87969426 + ... + 88118443.

It is an arithmetic number, because the mean of its divisors is an integer number (3280076798425).

Almost surely, 2^{13120131031321} is an apocalyptic number.

It is an amenable number.

13120131031321 is a deficient number, since it is larger than the sum of its proper divisors (176162379).

13120131031321 is an equidigital number, since it uses as much as digits as its factorization.

13120131031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176162378.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 13120131031321 its reverse (12313013102131), we get a palindrome (25433144133452).

The spelling of 13120131031321 in words is "thirteen trillion, one hundred twenty billion, one hundred thirty-one million, thirty-one thousand, three hundred twenty-one".