243121212563 has 2 divisors, whose sum is σ = 243121212564. Its totient is φ = 243121212562.

The previous prime is 243121212559. The next prime is 243121212577. The reversal of 243121212563 is 365212121342.

243121212563 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 is a cyclic number.

It is not a de Polignac number, because 243121212563 - 2² = 243121212559 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121212553) 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, 121560606281 + 121560606282.

It is an arithmetic number, because the mean of its divisors is an integer number (121560606282).

Almost surely, 2^243121212563 is an apocalyptic number.

243121212563 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121212563 is an equidigital number, since it uses as much as digits as its factorization.

243121212563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 32.

The spelling of 243121212563 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twelve thousand, five hundred sixty-three".