Adding to 13313021 its reverse (12031331), we get a palindrome (25344352).
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: 12031331 = 13 ⋅925487.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-13313021 is a prime.
It is a Duffinian number.
It is a congruent number.
Almost surely, 213313021 is an apocalyptic number.
It is an amenable number.
13313021 is an equidigital number, since it uses as much as digits as its factorization.
13313021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 578850.
The square root of 13313021 is about 3648.7012757966. The cubic root of 13313021 is about 237.0057444292.
The spelling of 13313021 in words is "thirteen million, three hundred thirteen thousand, twenty-one".