243125440121 has 4 divisors (see below), whose sum is σ = 243421574244. Its totient is φ = 242829306000.

The previous prime is 243125440111. The next prime is 243125440127. The reversal of 243125440121 is 121044521342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121044521342 = 2 ⋅60522260671.

It can be written as a sum of positive squares in 2 ways, for example, as 25596480121 + 217528960000 = 159989^2 + 466400^2 .

It is a cyclic number.

It is not a de Polignac number, because 243125440121 - 2⁶ = 243125440057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243125440127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148065830 + ... + 148067471.

It is an arithmetic number, because the mean of its divisors is an integer number (60855393561).

Almost surely, 2^243125440121 is an apocalyptic number.

It is an amenable number.

243125440121 is a deficient number, since it is larger than the sum of its proper divisors (296134123).

243125440121 is an equidigital number, since it uses as much as digits as its factorization.

243125440121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296134122.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 243125440121 its reverse (121044521342), we get a palindrome (364169961463).

The spelling of 243125440121 in words is "two hundred forty-three billion, one hundred twenty-five million, four hundred forty thousand, one hundred twenty-one".