243121240121 has 8 divisors (see below), whose sum is σ = 248583123840. Its totient is φ = 237671401968.

The previous prime is 243121240111. The next prime is 243121240163. The reversal of 243121240121 is 121042121342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121240121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243121240111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2970566 + ... + 3051311.

It is an arithmetic number, because the mean of its divisors is an integer number (31072890480).

Almost surely, 2^243121240121 is an apocalyptic number.

It is an amenable number.

243121240121 is a deficient number, since it is larger than the sum of its proper divisors (5461883719).

243121240121 is an equidigital number, since it uses as much as digits as its factorization.

243121240121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6022783.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 243121240121 its reverse (121042121342), we get a palindrome (364163361463).

The spelling of 243121240121 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, one hundred twenty-one".