221324845 has 8 divisors (see below), whose sum is σ = 303531264. Its totient is φ = 151765584.

The previous prime is 221324813. The next prime is 221324867. The reversal of 221324845 is 548423122.

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 221324845 - 2⁵ = 221324813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3161749 + ... + 3161818.

It is an arithmetic number, because the mean of its divisors is an integer number (37941408).

Almost surely, 2^221324845 is an apocalyptic number.

It is an amenable number.

221324845 is a deficient number, since it is larger than the sum of its proper divisors (82206419).

221324845 is an equidigital number, since it uses as much as digits as its factorization.

221324845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6323579.

The product of its digits is 15360, while the sum is 31.

The square root of 221324845 is about 14876.9904550618. The cubic root of 221324845 is about 604.8904430174.

Adding to 221324845 its reverse (548423122), we get a palindrome (769747967).

The spelling of 221324845 in words is "two hundred twenty-one million, three hundred twenty-four thousand, eight hundred forty-five".