221247607856 has 80 divisors (see below), whose sum is σ = 496643177088. Its totient is φ = 94365004800.

The previous prime is 221247607813. The next prime is 221247607897. The reversal of 221247607856 is 658706742122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 878651 + ... + 1102053.

Almost surely, 2^221247607856 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 221247607856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248321588544).

221247607856 is an abundant number, since it is smaller than the sum of its proper divisors (275395569232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221247607856 is a wasteful number, since it uses less digits than its factorization.

221247607856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223770 (or 223764 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 221247607856 in words is "two hundred twenty-one billion, two hundred forty-seven million, six hundred seven thousand, eight hundred fifty-six".