It is a tau number, because it is divible by the number of its divisors (144).
It is a congruent number.
It is an unprimeable number.
Almost surely, 21221204960 is an apocalyptic number.
1221204960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1221204960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088214128).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1221204960 is a wasteful number, since it uses less digits than its factorization.
1221204960 is an odious number, because the sum of its binary digits is odd.
The square root of 1221204960 is about 34945.7430883935. The cubic root of 1221204960 is about 1068.8814000747.
The spelling of 1221204960 in words is "one billion, two hundred twenty-one million, two hundred four thousand, nine hundred sixty".