It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-221534403655121 is a prime.
It is a Duffinian number.
Almost surely, 2221534403655121 is an apocalyptic number.
It is an amenable number.
221534403655121 is an equidigital number, since it uses as much as digits as its factorization.
221534403655121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 55992739.
The spelling of 221534403655121 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred three million, six hundred fifty-five thousand, one hundred twenty-one".