221304441 has 16 divisors (see below), whose sum is σ = 297597888. Its totient is φ = 146280000.

The previous prime is 221304439. The next prime is 221304451. The reversal of 221304441 is 144403122.

It is not a de Polignac number, because 221304441 - 2¹ = 221304439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221304451) 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, 208051 + ... + 209111.

It is an arithmetic number, because the mean of its divisors is an integer number (18599868).

Almost surely, 2^221304441 is an apocalyptic number.

It is an amenable number.

221304441 is a deficient number, since it is larger than the sum of its proper divisors (76293447).

221304441 is a wasteful number, since it uses less digits than its factorization.

221304441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 221304441 is about 14876.3046822791. The cubic root of 221304441 is about 604.8718541059.

Adding to 221304441 its reverse (144403122), we get a palindrome (365707563).

The spelling of 221304441 in words is "two hundred twenty-one million, three hundred four thousand, four hundred forty-one".