243105551321 has 16 divisors (see below), whose sum is σ = 246205267200. Its totient is φ = 240031948800.

The previous prime is 243105551287. The next prime is 243105551371. The reversal of 243105551321 is 123155501342.

243105551321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 243105551321 - 2⁶ = 243105551257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243105551371) 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 in 15 ways as a sum of consecutive naturals, for example, 13556441 + ... + 13574361.

It is an arithmetic number, because the mean of its divisors is an integer number (15387829200).

Almost surely, 2^243105551321 is an apocalyptic number.

It is an amenable number.

243105551321 is a deficient number, since it is larger than the sum of its proper divisors (3099715879).

243105551321 is a wasteful number, since it uses less digits than its factorization.

243105551321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18640.

The product of its (nonzero) digits is 18000, while the sum is 32.

The spelling of 243105551321 in words is "two hundred forty-three billion, one hundred five million, five hundred fifty-one thousand, three hundred twenty-one".