243121413005 has 4 divisors (see below), whose sum is σ = 291745695612. Its totient is φ = 194497130400.

The previous prime is 243121412969. The next prime is 243121413071. The reversal of 243121413005 is 500314121342.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47557577929 + 195563835076 = 218077^2 + 442226^2 .

It is not a de Polignac number, because 243121413005 - 2²⁰ = 243120364429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24312141296 + ... + 24312141305.

It is an arithmetic number, because the mean of its divisors is an integer number (72936423903).

Almost surely, 2^243121413005 is an apocalyptic number.

It is an amenable number.

243121413005 is a deficient number, since it is larger than the sum of its proper divisors (48624282607).

243121413005 is an equidigital number, since it uses as much as digits as its factorization.

243121413005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48624282606.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 243121413005 its reverse (500314121342), we get a palindrome (743435534347).

The spelling of 243121413005 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred thirteen thousand, five".