It is a happy number.
121342222243121 is nontrivially palindromic in base 10.
It is a Duffinian number.
Almost surely, 2121342222243121 is an apocalyptic number.
121342222243121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
121342222243121 is a wasteful number, since it uses less digits than its factorization.
121342222243121 is an odious number, because the sum of its binary digits is odd.
The spelling of 121342222243121 in words is "one hundred twenty-one trillion, three hundred forty-two billion, two hundred twenty-two million, two hundred forty-three thousand, one hundred twenty-one".