It is a tau number, because it is divible by the number of its divisors (80).
It is an unprimeable number.
Almost surely, 2221222111120 is an apocalyptic number.
221222111120 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.
221222111120 is a wasteful number, since it uses less digits than its factorization.
221222111120 is an evil number, because the sum of its binary digits is even.
Adding to 221222111120 its reverse (21111222122), we get a palindrome (242333333242).
The spelling of 221222111120 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred twenty".