243121211045 has 16 divisors (see below), whose sum is σ = 293529035520. Its totient is φ = 193308205824.

The previous prime is 243121210973. The next prime is 243121211111. The reversal of 243121211045 is 540112121342.

It is a happy number.

243121211045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121211045 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 9968576 + ... + 9992934.

It is an arithmetic number, because the mean of its divisors is an integer number (18345564720).

Almost surely, 2^243121211045 is an apocalyptic number.

It is an amenable number.

243121211045 is a deficient number, since it is larger than the sum of its proper divisors (50407824475).

243121211045 is a wasteful number, since it uses less digits than its factorization.

243121211045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36484.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 243121211045 its reverse (540112121342), we get a palindrome (783233332387).

The spelling of 243121211045 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred eleven thousand, forty-five".