243044012021321 has 16 divisors (see below), whose sum is σ = 283756434439680. Its totient is φ = 203832113311680.

The previous prime is 243044012021287. The next prime is 243044012021339. The reversal of 243044012021321 is 123120210440342.

It is a de Polignac number, because none of the positive numbers 2^k-243044012021321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243044012021341) 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 in 15 ways as a sum of consecutive naturals, for example, 105584186 + ... + 107861523.

It is an arithmetic number, because the mean of its divisors is an integer number (17734777152480).

Almost surely, 2^{243044012021321} is an apocalyptic number.

It is an amenable number.

243044012021321 is a deficient number, since it is larger than the sum of its proper divisors (40712422418359).

243044012021321 is a wasteful number, since it uses less digits than its factorization.

243044012021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213449224.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 243044012021321 its reverse (123120210440342), we get a palindrome (366164222461663).

The spelling of 243044012021321 in words is "two hundred forty-three trillion, forty-four billion, twelve million, twenty-one thousand, three hundred twenty-one".