Adding to 21100223211011 its reverse (11011232200112), we get a palindrome (32111455411123).
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a Duffinian number.
Almost surely, 221100223211011 is an apocalyptic number.
21100223211011 is an equidigital number, since it uses as much as digits as its factorization.
21100223211011 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3014317601580.
The spelling of 21100223211011 in words is "twenty-one trillion, one hundred billion, two hundred twenty-three million, two hundred eleven thousand, eleven".