221606986384 has 80 divisors (see below), whose sum is σ = 506668650496. Its totient is φ = 91885622400.

The previous prime is 221606986339. The next prime is 221606986451. The reversal of 221606986384 is 483689606122.

221606986384 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221606986384² (a number of 23 digits) contains 22 as substring.

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, 18142039 + ... + 18154249.

Almost surely, 2^221606986384 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 221606986384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253334325248).

221606986384 is an abundant number, since it is smaller than the sum of its proper divisors (285061664112).

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

221606986384 is a wasteful number, since it uses less digits than its factorization.

221606986384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17484 (or 17478 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 55.

The spelling of 221606986384 in words is "two hundred twenty-one billion, six hundred six million, nine hundred eighty-six thousand, three hundred eighty-four".