212121133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 2212121133 is an apocalyptic number.
It is an amenable number.
212121133 is a wasteful number, since it uses less digits than its factorization.
212121133 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 20867.
The square root of 212121133 is about 14564.3789088310. The cubic root of 212121133 is about 596.3867407566.
Adding to 212121133 its reverse (331121212), we get a palindrome (543242345).
The spelling of 212121133 in words is "two hundred twelve million, one hundred twenty-one thousand, one hundred thirty-three".