It is a congruent number.
It is an unprimeable number.
Almost surely, 2121413332320404 is an apocalyptic number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121413332320404 is a wasteful number, since it uses less digits than its factorization.
121413332320404 is an odious number, because the sum of its binary digits is odd.
Adding to 121413332320404 its reverse (404023233314121), we get a palindrome (525436565634525).
The spelling of 121413332320404 in words is "one hundred twenty-one trillion, four hundred thirteen billion, three hundred thirty-two million, three hundred twenty thousand, four hundred four".