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: 12202213033 = 61001 ⋅200033.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 233031220221 is an apocalyptic number.
It is an amenable number.
33031220221 is an equidigital number, since it uses as much as digits as its factorization.
33031220221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 60386690.
Adding to 33031220221 its reverse (12202213033), we get a palindrome (45233433254).
The spelling of 33031220221 in words is "thirty-three billion, thirty-one million, two hundred twenty thousand, two hundred twenty-one".