221424441 has 8 divisors (see below), whose sum is σ = 337408704. Its totient is φ = 126528240.

The previous prime is 221424433. The next prime is 221424443. The reversal of 221424441 is 144424122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221424441 - 2³ = 221424433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221424443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5271990 + ... + 5272031.

It is an arithmetic number, because the mean of its divisors is an integer number (42176088).

Almost surely, 2^221424441 is an apocalyptic number.

221424441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221424441 is a deficient number, since it is larger than the sum of its proper divisors (115984263).

221424441 is a wasteful number, since it uses less digits than its factorization.

221424441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10544031.

The product of its digits is 2048, while the sum is 24.

The square root of 221424441 is about 14880.3373953684. The cubic root of 221424441 is about 604.9811628131.

Adding to 221424441 its reverse (144424122), we get a palindrome (365848563).

The spelling of 221424441 in words is "two hundred twenty-one million, four hundred twenty-four thousand, four hundred forty-one".