It is a congruent number.
Almost surely, 2121220111221030 is an apocalyptic number.
121220111221030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
121220111221030 is a wasteful number, since it uses less digits than its factorization.
121220111221030 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 152201.
Adding to 121220111221030 its reverse (30122111022121), we get a palindrome (151342222243151).
The spelling of 121220111221030 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, thirty".