Adding to 212100000 its reverse (1212), we get a palindrome (212101212).
It is a happy number.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is an unprimeable number.
Almost surely, 2212100000 is an apocalyptic number.
212100000 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 212100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401599296).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
212100000 is an equidigital number, since it uses as much as digits as its factorization.
212100000 is an odious number, because the sum of its binary digits is odd.
The square root of 212100000 is about 14563.6533878007. The cubic root of 212100000 is about 596.3669346842.
The spelling of 212100000 in words is "two hundred twelve million, one hundred thousand".