221322243 has 4 divisors (see below), whose sum is σ = 295096328. Its totient is φ = 147548160.

The previous prime is 221322193. The next prime is 221322293. The reversal of 221322243 is 342223122.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (221322193) and next prime (221322293).

It is not a de Polignac number, because 221322243 - 2¹⁷ = 221191171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221322293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36887038 + ... + 36887043.

It is an arithmetic number, because the mean of its divisors is an integer number (73774082).

Almost surely, 2^221322243 is an apocalyptic number.

221322243 is a deficient number, since it is larger than the sum of its proper divisors (73774085).

221322243 is an equidigital number, since it uses as much as digits as its factorization.

221322243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73774084.

The product of its digits is 1152, while the sum is 21.

The square root of 221322243 is about 14876.9030043218. The cubic root of 221322243 is about 604.8880725483. Note that the first 3 decimals are identical.

Adding to 221322243 its reverse (342223122), we get a palindrome (563545365).

The spelling of 221322243 in words is "two hundred twenty-one million, three hundred twenty-two thousand, two hundred forty-three".