243121403534 has 16 divisors (see below), whose sum is σ = 368465143200. Its totient is φ = 120299848704.

The previous prime is 243121403533. The next prime is 243121403543. The reversal of 243121403534 is 435304121342.

243121403534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 243121403534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121403531) 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, 4153382 + ... + 4211510.

It is an arithmetic number, because the mean of its divisors is an integer number (23029071450).

Almost surely, 2^243121403534 is an apocalyptic number.

243121403534 is a deficient number, since it is larger than the sum of its proper divisors (125343739666).

243121403534 is a wasteful number, since it uses less digits than its factorization.

243121403534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79787.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 243121403534 its reverse (435304121342), we get a palindrome (678425524876).

The spelling of 243121403534 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred three thousand, five hundred thirty-four".