243121341 has 4 divisors (see below), whose sum is σ = 324161792. Its totient is φ = 162080892.

The previous prime is 243121331. The next prime is 243121343. The reversal of 243121341 is 143121342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 243121341 - 2⁵ = 243121309 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 (243121343) 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, 40520221 + ... + 40520226.

It is an arithmetic number, because the mean of its divisors is an integer number (81040448).

Almost surely, 2^243121341 is an apocalyptic number.

It is an amenable number.

243121341 is a deficient number, since it is larger than the sum of its proper divisors (81040451).

243121341 is an equidigital number, since it uses as much as digits as its factorization.

243121341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81040450.

The product of its digits is 576, while the sum is 21.

The square root of 243121341 is about 15592.3487967657. The cubic root of 243121341 is about 624.1289977186.

Adding to 243121341 its reverse (143121342), we get a palindrome (386242683).

Subtracting from 243121341 its reverse (143121342), we obtain a palindrome (99999999).

The spelling of 243121341 in words is "two hundred forty-three million, one hundred twenty-one thousand, three hundred forty-one".