221441221 has 8 divisors (see below), whose sum is σ = 223660800. Its totient is φ = 219229920.

The previous prime is 221441197. The next prime is 221441237. The reversal of 221441221 is 122144122.

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

It is a cyclic number.

It is not a de Polignac number, because 221441221 - 2⁷ = 221441093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221441621) 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, 60985 + ... + 64513.

It is an arithmetic number, because the mean of its divisors is an integer number (27957600).

Almost surely, 2^221441221 is an apocalyptic number.

It is an amenable number.

221441221 is a deficient number, since it is larger than the sum of its proper divisors (2219579).

221441221 is a wasteful number, since it uses less digits than its factorization.

221441221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139.

The product of its digits is 256, while the sum is 19.

The square root of 221441221 is about 14880.9012159882. The cubic root of 221441221 is about 604.9964446664.

Adding to 221441221 its reverse (122144122), we get a palindrome (343585343).

The spelling of 221441221 in words is "two hundred twenty-one million, four hundred forty-one thousand, two hundred twenty-one".