Adding to 21163634130215 its reverse (51203143636112), we get a palindrome (72366777766327).
It is a de Polignac number, because none of the positive numbers 2k-21163634130215 is a prime.
It is a Duffinian number.
It is a congruent number.
Almost surely, 221163634130215 is an apocalyptic number.
21163634130215 is a wasteful number, since it uses less digits than its factorization.
21163634130215 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2847850.
The spelling of 21163634130215 in words is "twenty-one trillion, one hundred sixty-three billion, six hundred thirty-four million, one hundred thirty thousand, two hundred fifteen".