13011121121 has 4 divisors (see below), whose sum is σ = 13459780500. Its totient is φ = 12562461744.

The previous prime is 13011121111. The next prime is 13011121129. The reversal of 13011121121 is 12112111031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12112111031 = 127 ⋅95370953.

It can be written as a sum of positive squares in 2 ways, for example, as 7510822225 + 5500298896 = 86665^2 + 74164^2 .

It is not a de Polignac number, because 13011121121 - 2²² = 13006926817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13011121096 and 13011121105.

It is not an unprimeable number, because it can be changed into a prime (13011121129) 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, 224329646 + ... + 224329703.

It is an arithmetic number, because the mean of its divisors is an integer number (3364945125).

Almost surely, 2^13011121121 is an apocalyptic number.

It is an amenable number.

13011121121 is a deficient number, since it is larger than the sum of its proper divisors (448659379).

13011121121 is an equidigital number, since it uses as much as digits as its factorization.

13011121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448659378.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 13011121121 its reverse (12112111031), we get a palindrome (25123232152).

The spelling of 13011121121 in words is "thirteen billion, eleven million, one hundred twenty-one thousand, one hundred twenty-one".