243440234121 has 16 divisors (see below), whose sum is σ = 371313612800. Its totient is φ = 138974805648.

The previous prime is 243440234111. The next prime is 243440234143. The reversal of 243440234121 is 121432044342.

243440234121 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 243440234121 - 2¹⁸ = 243439971977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243440234101) 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, 5556811 + ... + 5600448.

It is an arithmetic number, because the mean of its divisors is an integer number (23207100800).

Almost surely, 2^243440234121 is an apocalyptic number.

243440234121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243440234121 is a deficient number, since it is larger than the sum of its proper divisors (127873378679).

243440234121 is a wasteful number, since it uses less digits than its factorization.

243440234121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11158308.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 243440234121 its reverse (121432044342), we get a palindrome (364872278463).

The spelling of 243440234121 in words is "two hundred forty-three billion, four hundred forty million, two hundred thirty-four thousand, one hundred twenty-one".