Adding to 21011002000 its reverse (20011012), we get a palindrome (21031013012).
It is an unprimeable number.
Almost surely, 221011002000 is an apocalyptic number.
21011002000 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 21011002000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25999496640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21011002000 is a wasteful number, since it uses less digits than its factorization.
21011002000 is an odious number, because the sum of its binary digits is odd.
The spelling of 21011002000 in words is "twenty-one billion, eleven million, two thousand".