13111121 has 4 divisors (see below), whose sum is σ = 13801200. Its totient is φ = 12421044.

The previous prime is 13111117. The next prime is 13111129. The reversal of 13111121 is 12111131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12111131 = 227 ⋅53353.

It is a cyclic number.

It is not a de Polignac number, because 13111121 - 2² = 13111117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13111129) 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, 345011 + ... + 345048.

It is an arithmetic number, because the mean of its divisors is an integer number (3450300).

Almost surely, 2^13111121 is an apocalyptic number.

It is an amenable number.

13111121 is a deficient number, since it is larger than the sum of its proper divisors (690079).

13111121 is an equidigital number, since it uses as much as digits as its factorization.

13111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690078.

The product of its digits is 6, while the sum is 11.

The square root of 13111121 is about 3620.9281959188. The cubic root of 13111121 is about 235.8015244536.

Adding to 13111121 its reverse (12111131), we get a palindrome (25222252).

The spelling of 13111121 in words is "thirteen million, one hundred eleven thousand, one hundred twenty-one".