243131542432121 has 16 divisors (see below), whose sum is σ = 281327237009280. Its totient is φ = 205813957587840.

The previous prime is 243131542432117. The next prime is 243131542432157. The reversal of 243131542432121 is 121234245131342.

243131542432121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243131542432121 - 2² = 243131542432117 is a prime.

It is a super-2 number, since 2×243131542432121² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243131542462121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518743100 + ... + 519211581.

It is an arithmetic number, because the mean of its divisors is an integer number (17582952313080).

Almost surely, 2^{243131542432121} is an apocalyptic number.

It is an amenable number.

243131542432121 is a deficient number, since it is larger than the sum of its proper divisors (38195694577159).

243131542432121 is a wasteful number, since it uses less digits than its factorization.

243131542432121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037955104.

The product of its digits is 138240, while the sum is 38.

Adding to 243131542432121 its reverse (121234245131342), we get a palindrome (364365787563463).

The spelling of 243131542432121 in words is "two hundred forty-three trillion, one hundred thirty-one billion, five hundred forty-two million, four hundred thirty-two thousand, one hundred twenty-one".