221443384 has 8 divisors (see below), whose sum is σ = 415206360. Its totient is φ = 110721688.

The previous prime is 221443373. The next prime is 221443403. The reversal of 221443384 is 483344122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13840204 + ... + 13840219.

It is an arithmetic number, because the mean of its divisors is an integer number (51900795).

Almost surely, 2^221443384 is an apocalyptic number.

It is an amenable number.

221443384 is a deficient number, since it is larger than the sum of its proper divisors (193762976).

221443384 is a wasteful number, since it uses less digits than its factorization.

221443384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27680429 (or 27680425 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 221443384 is about 14880.9738928606. The cubic root of 221443384 is about 604.9984144939.

The spelling of 221443384 in words is "two hundred twenty-one million, four hundred forty-three thousand, three hundred eighty-four".