It is a congruent number.
Almost surely, 220040121034031 is an apocalyptic number.
20040121034031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.
20040121034031 is a wasteful number, since it uses less digits than its factorization.
20040121034031 is an evil number, because the sum of its binary digits is even.
Adding to 20040121034031 its reverse (13043012104002), we get a palindrome (33083133138033).
The spelling of 20040121034031 in words is "twenty trillion, forty billion, one hundred twenty-one million, thirty-four thousand, thirty-one".