221221303 has 8 divisors (see below), whose sum is σ = 225067680. Its totient is φ = 217395360.

The previous prime is 221221249. The next prime is 221221327. The reversal of 221221303 is 303122122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221221303 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 (221221333) 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 7 ways as a sum of consecutive naturals, for example, 17593 + ... + 27421.

It is an arithmetic number, because the mean of its divisors is an integer number (28133460).

Almost surely, 2^221221303 is an apocalyptic number.

221221303 is a deficient number, since it is larger than the sum of its proper divisors (3846377).

221221303 is an equidigital number, since it uses as much as digits as its factorization.

221221303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10217.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221221303 is about 14873.5101102598. The cubic root of 221221303 is about 604.7961000382.

Adding to 221221303 its reverse (303122122), we get a palindrome (524343425).

The spelling of 221221303 in words is "two hundred twenty-one million, two hundred twenty-one thousand, three hundred three".