243344303221 has 2 divisors, whose sum is σ = 243344303222. Its totient is φ = 243344303220.

The previous prime is 243344303219. The next prime is 243344303281. The reversal of 243344303221 is 122303443342.

It is a happy number.

243344303221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206052444900 + 37291858321 = 453930^2 + 193111^2 .

It is a cyclic number.

It is not a de Polignac number, because 243344303221 - 2¹ = 243344303219 is a prime.

It is a super-2 number, since 2×243344303221² (a number of 24 digits) contains 22 as substring.

Together with 243344303219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243344303281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121672151610 + 121672151611.

It is an arithmetic number, because the mean of its divisors is an integer number (121672151611).

Almost surely, 2^243344303221 is an apocalyptic number.

It is an amenable number.

243344303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

243344303221 is an equidigital number, since it uses as much as digits as its factorization.

243344303221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 243344303221 its reverse (122303443342), we get a palindrome (365647746563).

The spelling of 243344303221 in words is "two hundred forty-three billion, three hundred forty-four million, three hundred three thousand, two hundred twenty-one".