It is a tau number, because it is divible by the number of its divisors (96).
It is a congruent number.
It is an unprimeable number.
Almost surely, 221742743619680 is an apocalyptic number.
21742743619680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21742743619680 is a wasteful number, since it uses less digits than its factorization.
21742743619680 is an odious number, because the sum of its binary digits is odd.
The spelling of 21742743619680 in words is "twenty-one trillion, seven hundred forty-two billion, seven hundred forty-three million, six hundred nineteen thousand, six hundred eighty".