It is a happy number.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 212001201022221 is an apocalyptic number.
It is an amenable number.
12001201022221 is an equidigital number, since it uses as much as digits as its factorization.
12001201022221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 38589071122.
Adding to 12001201022221 its reverse (12222010210021), we get a palindrome (24223211232242).
The spelling of 12001201022221 in words is "twelve trillion, one billion, two hundred one million, twenty-two thousand, two hundred twenty-one".