221444443 has 4 divisors (see below), whose sum is σ = 241575768. Its totient is φ = 201313120.

The previous prime is 221444423. The next prime is 221444459. The reversal of 221444443 is 344444122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221444443 - 2²¹ = 219347291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221444423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10065646 + ... + 10065667.

It is an arithmetic number, because the mean of its divisors is an integer number (60393942).

Almost surely, 2^221444443 is an apocalyptic number.

221444443 is a deficient number, since it is larger than the sum of its proper divisors (20131325).

221444443 is a wasteful number, since it uses less digits than its factorization.

221444443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20131324.

The product of its digits is 12288, while the sum is 28.

The square root of 221444443 is about 14881.0094751667. The cubic root of 221444443 is about 604.9993789125. Note that the first 3 decimals are identical.

Adding to 221444443 its reverse (344444122), we get a palindrome (565888565).

The spelling of 221444443 in words is "two hundred twenty-one million, four hundred forty-four thousand, four hundred forty-three".