Adding to 212021121312 its reverse (213121120212), we get a palindrome (425142241524).
212021121312 is a `hidden beast` number, since 2 + 120 + 211 + 21 + 312 = 666.
Almost surely, 2212021121312 is an apocalyptic number.
212021121312 is a gapful number since it is divisible by the number (22) 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 212021121312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (424187880480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
212021121312 is a wasteful number, since it uses less digits than its factorization.
212021121312 is an evil number, because the sum of its binary digits is even.
The spelling of 212021121312 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, three hundred twelve".