243012144121 has 4 divisors (see below), whose sum is σ = 243013130100. Its totient is φ = 243011158144.

The previous prime is 243012144091. The next prime is 243012144143. The reversal of 243012144121 is 121441210342.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 168231225600 + 74780918521 = 410160^2 + 273461^2 .

It is a cyclic number.

It is not a de Polignac number, because 243012144121 - 2¹⁹ = 243011619833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243012844121) 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, 238845 + ... + 736933.

It is an arithmetic number, because the mean of its divisors is an integer number (60753282525).

Almost surely, 2^243012144121 is an apocalyptic number.

It is an amenable number.

243012144121 is a deficient number, since it is larger than the sum of its proper divisors (985979).

243012144121 is an equidigital number, since it uses as much as digits as its factorization.

243012144121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985978.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 243012144121 its reverse (121441210342), we get a palindrome (364453354463).

The spelling of 243012144121 in words is "two hundred forty-three billion, twelve million, one hundred forty-four thousand, one hundred twenty-one".