243121240043 has 4 divisors (see below), whose sum is σ = 265223170968. Its totient is φ = 221019309120.

The previous prime is 243121240001. The next prime is 243121240049. The reversal of 243121240043 is 340042121342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243121240043 - 2⁸ = 243121239787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243121239994 and 243121240021.

It is not an unprimeable number, because it can be changed into a prime (243121240049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11050965446 + ... + 11050965467.

It is an arithmetic number, because the mean of its divisors is an integer number (66305792742).

Almost surely, 2^243121240043 is an apocalyptic number.

243121240043 is a deficient number, since it is larger than the sum of its proper divisors (22101930925).

243121240043 is a wasteful number, since it uses less digits than its factorization.

243121240043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22101930924.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 243121240043 its reverse (340042121342), we get a palindrome (583163361385).

The spelling of 243121240043 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, forty-three".