243121240005 has 32 divisors (see below), whose sum is σ = 444606153984. Its totient is φ = 111130738176.

The previous prime is 243121240001. The next prime is 243121240049. The reversal of 243121240005 is 500042121342.

It is not a de Polignac number, because 243121240005 - 2² = 243121240001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121240001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1080967 + ... + 1286363.

It is an arithmetic number, because the mean of its divisors is an integer number (13893942312).

Almost surely, 2^243121240005 is an apocalyptic number.

It is an amenable number.

243121240005 is a deficient number, since it is larger than the sum of its proper divisors (201484913979).

243121240005 is a wasteful number, since it uses less digits than its factorization.

243121240005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216685.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 243121240005 its reverse (500042121342), we get a palindrome (743163361347).

The spelling of 243121240005 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, five".