13120131121 has 4 divisors (see below), whose sum is σ = 13177424500. Its totient is φ = 13062837744.

The previous prime is 13120131119. The next prime is 13120131149. The reversal of 13120131121 is 12113102131.

It is a happy number.

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 12655125025 + 465006096 = 112495^2 + 21564^2 .

It is a cyclic number.

It is not a de Polignac number, because 13120131121 - 2¹ = 13120131119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13120131095 and 13120131104.

It is not an unprimeable number, because it can be changed into a prime (13120131181) 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, 28646346 + ... + 28646803.

It is an arithmetic number, because the mean of its divisors is an integer number (3294356125).

Almost surely, 2^13120131121 is an apocalyptic number.

It is an amenable number.

13120131121 is a deficient number, since it is larger than the sum of its proper divisors (57293379).

13120131121 is an equidigital number, since it uses as much as digits as its factorization.

13120131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57293378.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 13120131121 its reverse (12113102131), we get a palindrome (25233233252).

The spelling of 13120131121 in words is "thirteen billion, one hundred twenty million, one hundred thirty-one thousand, one hundred twenty-one".