243121231045 has 32 divisors (see below), whose sum is σ = 385130785536. Its totient is φ = 142641024000.

The previous prime is 243121231039. The next prime is 243121231049. The reversal of 243121231045 is 540132121342.

243121231045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243121231045 - 2¹¹ = 243121228997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121231049) 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 31 ways as a sum of consecutive naturals, for example, 18566506 + ... + 18579595.

It is an arithmetic number, because the mean of its divisors is an integer number (12035337048).

Almost surely, 2^243121231045 is an apocalyptic number.

It is an amenable number.

243121231045 is a deficient number, since it is larger than the sum of its proper divisors (142009554491).

243121231045 is a wasteful number, since it uses less digits than its factorization.

243121231045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37146141.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 243121231045 its reverse (540132121342), we get a palindrome (783253352387).

The spelling of 243121231045 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-one thousand, forty-five".