243121245005 has 4 divisors (see below), whose sum is σ = 291745494012. Its totient is φ = 194496996000.

The previous prime is 243121244911. The next prime is 243121245007. The reversal of 243121245005 is 500542121342.

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 191033681476 + 52087563529 = 437074^2 + 228227^2 .

It is not a de Polignac number, because 243121245005 - 2⁸ = 243121244749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121245007) 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, 24312124496 + ... + 24312124505.

It is an arithmetic number, because the mean of its divisors is an integer number (72936373503).

Almost surely, 2^243121245005 is an apocalyptic number.

It is an amenable number.

243121245005 is a deficient number, since it is larger than the sum of its proper divisors (48624249007).

243121245005 is an equidigital number, since it uses as much as digits as its factorization.

243121245005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48624249006.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 243121245005 its reverse (500542121342), we get a palindrome (743663366347).

The spelling of 243121245005 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, five".