Adding to 11121313 its reverse (31312111), we get a palindrome (42433424).
11121313 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
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: 31312111 = 281 ⋅111431.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-11121313 is a prime.
It is a Duffinian number.
Almost surely, 211121313 is an apocalyptic number.
It is an amenable number.
11121313 is an equidigital number, since it uses as much as digits as its factorization.
11121313 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1588766.
The square root of 11121313 is about 3334.8632655628. The cubic root of 11121313 is about 223.2125906084.
The spelling of 11121313 in words is "eleven million, one hundred twenty-one thousand, three hundred thirteen".