Adding to 11331131121103 its reverse (30112113113311), we get a palindrome (41443244234414).
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, 211331131121103 is an apocalyptic number.
11331131121103 is an equidigital number, since it uses as much as digits as its factorization.
11331131121103 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7042345376.
The spelling of 11331131121103 in words is "eleven trillion, three hundred thirty-one billion, one hundred thirty-one million, one hundred twenty-one thousand, one hundred three".