243121235113 has 2 divisors, whose sum is σ = 243121235114. Its totient is φ = 243121235112.

The previous prime is 243121235111. The next prime is 243121235129. The reversal of 243121235113 is 311532121342.

243121235113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141276001689 + 101845233424 = 375867^2 + 319132^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121235113 - 2¹ = 243121235111 is a prime.

Together with 243121235111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243121235111) 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 as a sum of consecutive naturals, namely, 121560617556 + 121560617557.

It is an arithmetic number, because the mean of its divisors is an integer number (121560617557).

Almost surely, 2^243121235113 is an apocalyptic number.

It is an amenable number.

243121235113 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121235113 is an equidigital number, since it uses as much as digits as its factorization.

243121235113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

Adding to 243121235113 its reverse (311532121342), we get a palindrome (554653356455).

The spelling of 243121235113 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-five thousand, one hundred thirteen".