It is a tau number, because it is divible by the number of its divisors (480).
It is a congruent number.
It is an unprimeable number.
Almost surely, 221211010220000 is an apocalyptic number.
21211010220000 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 practical number, because each smaller number is the sum of distinct divisors of 21211010220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35872047820224).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21211010220000 is an equidigital number, since it uses as much as digits as its factorization.
21211010220000 is an evil number, because the sum of its binary digits is even.
Adding to 21211010220000 its reverse (2201011212), we get a palindrome (21213211231212).
The spelling of 21211010220000 in words is "twenty-one trillion, two hundred eleven billion, ten million, two hundred twenty thousand".