121555379316 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a congruent number.
It is an unprimeable number.
Almost surely, 2121555379316 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 121555379316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177422192640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121555379316 is a wasteful number, since it uses less digits than its factorization.
121555379316 is an evil number, because the sum of its binary digits is even.
The spelling of 121555379316 in words is "one hundred twenty-one billion, five hundred fifty-five million, three hundred seventy-nine thousand, three hundred sixteen".