Adding to 13023221 its reverse (12232031), we get a palindrome (25255252).
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: 12232031 = 7 ⋅1747433.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 213023221 is an apocalyptic number.
It is an amenable number.
13023221 is an equidigital number, since it uses as much as digits as its factorization.
13023221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 566250.
The square root of 13023221 is about 3608.7700120678. The cubic root of 13023221 is about 235.2733863757.
The spelling of 13023221 in words is "thirteen million, twenty-three thousand, two hundred twenty-one".