Almost surely, 221311020300 is an apocalyptic number.
21311020300 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 21311020300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24536929536).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21311020300 is a wasteful number, since it uses less digits than its factorization.
21311020300 is an evil number, because the sum of its binary digits is even.
Adding to 21311020300 its reverse (302011312), we get a palindrome (21613031612).
The spelling of 21311020300 in words is "twenty-one billion, three hundred eleven million, twenty thousand, three hundred".