It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 221224032520231 is an apocalyptic number.
21224032520231 is a wasteful number, since it uses less digits than its factorization.
21224032520231 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10596124080.
Adding to 21224032520231 its reverse (13202523042212), we get a palindrome (34426555562443).
The spelling of 21224032520231 in words is "twenty-one trillion, two hundred twenty-four billion, thirty-two million, five hundred twenty thousand, two hundred thirty-one".