Adding to 21442303212 its reverse (21230324412), we get a palindrome (42672627624).
It is a happy number.
Almost surely, 221442303212 is an apocalyptic number.
21442303212 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 21442303212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27823219200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21442303212 is a wasteful number, since it uses less digits than its factorization.
21442303212 is an evil number, because the sum of its binary digits is even.
The spelling of 21442303212 in words is "twenty-one billion, four hundred forty-two million, three hundred three thousand, two hundred twelve".