Adding to 21022003243 its reverse (34230022012), we get a palindrome (55252025255).
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-21022003243 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 21022003243.
Almost surely, 221022003243 is an apocalyptic number.
21022003243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.
21022003243 is an equidigital number, since it uses as much as digits as its factorization.
21022003243 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 914000164.
The spelling of 21022003243 in words is "twenty-one billion, twenty-two million, three thousand, two hundred forty-three".