243121203341 has 2 divisors, whose sum is σ = 243121203342. Its totient is φ = 243121203340.

The previous prime is 243121203331. The next prime is 243121203343. The reversal of 243121203341 is 143302121342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214696929316 + 28424274025 = 463354^2 + 168595^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121203341 - 2¹⁸ = 243120941197 is a prime.

Together with 243121203343, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243121203341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121203343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560601670 + 121560601671.

It is an arithmetic number, because the mean of its divisors is an integer number (121560601671).

Almost surely, 2^243121203341 is an apocalyptic number.

It is an amenable number.

243121203341 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121203341 is an equidigital number, since it uses as much as digits as its factorization.

243121203341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 243121203341 its reverse (143302121342), we get a palindrome (386423324683).

The spelling of 243121203341 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred three thousand, three hundred forty-one".