Adding to 123221 its reverse (122321), we get a palindrome (245542).
Subtracting from 123221 its reverse (122321), we obtain a square (900 = 302).
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a Duffinian number.
It is a plaindrome in base 15.
It is a congruent number.
2123221 is an apocalyptic number.
123221 is the 203-rd octagonal number.
It is an amenable number.
123221 is an equidigital number, since it uses as much as digits as its factorization.
123221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 643.
The square root of 123221 is about 351.0284888723. The cubic root of 123221 is about 49.7616657407.
The spelling of 123221 in words is "one hundred twenty-three thousand, two hundred twenty-one", and thus it is an iban number.