It is a sphenic number, since it is the product of 3 distinct primes.
It is a self number, because there is not a number n which added to its sum of digits gives 33121221.
It is a congruent number.
Almost surely, 233121221 is an apocalyptic number.
It is an amenable number.
33121221 is a wasteful number, since it uses less digits than its factorization.
33121221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1577211.
The square root of 33121221 is about 5755.1039087057. The cubic root of 33121221 is about 321.1457010755.
Adding to 33121221 its reverse (12212133), we get a palindrome (45333354).
The spelling of 33121221 in words is "thirty-three million, one hundred twenty-one thousand, two hundred twenty-one".