243221107 has 2 divisors, whose sum is σ = 243221108. Its totient is φ = 243221106.

The previous prime is 243221093. The next prime is 243221161. The reversal of 243221107 is 701122342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243221107 - 2¹¹ = 243219059 is a prime.

It is a super-3 number, since 3×243221107³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (243221197) 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 as a sum of consecutive naturals, namely, 121610553 + 121610554.

It is an arithmetic number, because the mean of its divisors is an integer number (121610554).

Almost surely, 2^243221107 is an apocalyptic number.

243221107 is a deficient number, since it is larger than the sum of its proper divisors (1).

243221107 is an equidigital number, since it uses as much as digits as its factorization.

243221107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 243221107 is about 15595.5476659206. The cubic root of 243221107 is about 624.2143574791.

Adding to 243221107 its reverse (701122342), we get a palindrome (944343449).

The spelling of 243221107 in words is "two hundred forty-three million, two hundred twenty-one thousand, one hundred seven".