221144441 has 16 divisors (see below), whose sum is σ = 257541120. Its totient is φ = 185982720.

The previous prime is 221144437. The next prime is 221144479. The reversal of 221144441 is 144441122.

It is not a de Polignac number, because 221144441 - 2² = 221144437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221144411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84056 + ... + 86646.

It is an arithmetic number, because the mean of its divisors is an integer number (16096320).

Almost surely, 2^221144441 is an apocalyptic number.

It is an amenable number.

221144441 is a deficient number, since it is larger than the sum of its proper divisors (36396679).

221144441 is a wasteful number, since it uses less digits than its factorization.

221144441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824.

The product of its digits is 1024, while the sum is 23.

The square root of 221144441 is about 14870.9260303453. The cubic root of 221144441 is about 604.7260476789.

Adding to 221144441 its reverse (144441122), we get a palindrome (365585563).

The spelling of 221144441 in words is "two hundred twenty-one million, one hundred forty-four thousand, four hundred forty-one".