It is a sphenic number, since it is the product of 3 distinct primes.
It is an unprimeable number.
Almost surely, 221213543315106 is an apocalyptic number.
21213543315106 is a wasteful number, since it uses less digits than its factorization.
21213543315106 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 461163985136.
Adding to 21213543315106 its reverse (60151334531212), we get a palindrome (81364877846318).
The spelling of 21213543315106 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fifteen thousand, one hundred six".