243120344021 has 8 divisors (see below), whose sum is σ = 244062725400. Its totient is φ = 242179660800.

The previous prime is 243120343933. The next prime is 243120344029. The reversal of 243120344021 is 120443021342.

243120344021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 193340487025 + 49779856996 = 439705^2 + 223114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243120344021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243120344029) 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 7 ways as a sum of consecutive naturals, for example, 137276 + ... + 710693.

It is an arithmetic number, because the mean of its divisors is an integer number (30507840675).

Almost surely, 2^243120344021 is an apocalyptic number.

It is an amenable number.

243120344021 is a deficient number, since it is larger than the sum of its proper divisors (942381379).

243120344021 is an equidigital number, since it uses as much as digits as its factorization.

243120344021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849079.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 243120344021 its reverse (120443021342), we get a palindrome (363563365363).

The spelling of 243120344021 in words is "two hundred forty-three billion, one hundred twenty million, three hundred forty-four thousand, twenty-one".