243044304421 has 2 divisors, whose sum is σ = 243044304422. Its totient is φ = 243044304420.

The previous prime is 243044304397. The next prime is 243044304463. The reversal of 243044304421 is 124403440342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236817516321 + 6226788100 = 486639^2 + 78910^2 .

It is a cyclic number.

It is not a de Polignac number, because 243044304421 - 2¹⁵ = 243044271653 is a prime.

It is a super-2 number, since 2×243044304421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243044304721) 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, 121522152210 + 121522152211.

It is an arithmetic number, because the mean of its divisors is an integer number (121522152211).

Almost surely, 2^243044304421 is an apocalyptic number.

It is an amenable number.

243044304421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243044304421 is an equidigital number, since it uses as much as digits as its factorization.

243044304421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 243044304421 its reverse (124403440342), we get a palindrome (367447744763).

The spelling of 243044304421 in words is "two hundred forty-three billion, forty-four million, three hundred four thousand, four hundred twenty-one".