243121204506 has 16 divisors (see below), whose sum is σ = 486290347200. Its totient is φ = 81032411808.

The previous prime is 243121204477. The next prime is 243121204583. The reversal of 243121204506 is 605402121342.

243121204506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 1931326 + ... + 2053353.

It is an arithmetic number, because the mean of its divisors is an integer number (30393146700).

Almost surely, 2^243121204506 is an apocalyptic number.

243121204506 is an abundant number, since it is smaller than the sum of its proper divisors (243169142694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243121204506 is a wasteful number, since it uses less digits than its factorization.

243121204506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994853.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 243121204506 its reverse (605402121342), we get a palindrome (848523325848).

The spelling of 243121204506 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred four thousand, five hundred six".