2202221 is digitally balanced in base 2, 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: 1222022 = 2 ⋅611011.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
22202221 is an apocalyptic number.
It is an amenable number.
2202221 is an equidigital number, since it uses as much as digits as its factorization.
2202221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 314610.
The square root of 2202221 is about 1483.9882075003. The cubic root of 2202221 is about 130.1028968380.
Adding to 2202221 its reverse (1222022), we get a palindrome (3424243).
The spelling of 2202221 in words is "two million, two hundred two thousand, two hundred twenty-one".