221443984 has 10 divisors (see below), whose sum is σ = 429047750. Its totient is φ = 110721984.

The previous prime is 221443973. The next prime is 221443987. The reversal of 221443984 is 489344122.

It can be written as a sum of positive squares in only one way, i.e., 221414400 + 29584 = 14880^2 + 172^2 .

It is not an unprimeable number, because it can be changed into a prime (221443987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6920109 + ... + 6920140.

It is an arithmetic number, because the mean of its divisors is an integer number (42904775).

Almost surely, 2^221443984 is an apocalyptic number.

It is an amenable number.

221443984 is a deficient number, since it is larger than the sum of its proper divisors (207603766).

221443984 is a wasteful number, since it uses less digits than its factorization.

221443984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13840257 (or 13840251 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 221443984 is about 14880.9940528178. The cubic root of 221443984 is about 604.9989609071.

The spelling of 221443984 in words is "two hundred twenty-one million, four hundred forty-three thousand, nine hundred eighty-four".