243787321121 has 8 divisors (see below), whose sum is σ = 256328106600. Its totient is φ = 231522157440.

The previous prime is 243787321117. The next prime is 243787321139. The reversal of 243787321121 is 121123787342.

243787321121 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 27320453521 + 216466867600 = 165289^2 + 465260^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 243787321121 - 2² = 243787321117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243787311121) 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, 68903636 + ... + 68907173.

It is an arithmetic number, because the mean of its divisors is an integer number (32041013325).

Almost surely, 2^243787321121 is an apocalyptic number.

It is an amenable number.

243787321121 is a deficient number, since it is larger than the sum of its proper divisors (12540785479).

243787321121 is a wasteful number, since it uses less digits than its factorization.

243787321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137810899.

The product of its digits is 112896, while the sum is 41.

The spelling of 243787321121 in words is "two hundred forty-three billion, seven hundred eighty-seven million, three hundred twenty-one thousand, one hundred twenty-one".