221101212120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a self number, because there is not a number n which added to its sum of digits gives 221101212120.
It is a congruent number.
It is an unprimeable number.
Almost surely, 2221101212120 is an apocalyptic number.
221101212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
221101212120 is a wasteful number, since it uses less digits than its factorization.
221101212120 is an odious number, because the sum of its binary digits is odd.
Adding to 221101212120 its reverse (21212101122), we get a palindrome (242313313242).
The spelling of 221101212120 in words is "two hundred twenty-one billion, one hundred one million, two hundred twelve thousand, one hundred twenty".