243113322121 has 2 divisors, whose sum is σ = 243113322122. Its totient is φ = 243113322120.

The previous prime is 243113322107. The next prime is 243113322131. The reversal of 243113322121 is 121223311342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233347929721 + 9765392400 = 483061^2 + 98820^2 .

It is a cyclic number.

It is not a de Polignac number, because 243113322121 - 2⁷ = 243113321993 is a prime.

It is not a weakly prime, because it can be changed into another prime (243113322131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121556661060 + 121556661061.

It is an arithmetic number, because the mean of its divisors is an integer number (121556661061).

Almost surely, 2^243113322121 is an apocalyptic number.

It is an amenable number.

243113322121 is a deficient number, since it is larger than the sum of its proper divisors (1).

243113322121 is an equidigital number, since it uses as much as digits as its factorization.

243113322121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

Adding to 243113322121 its reverse (121223311342), we get a palindrome (364336633463).

The spelling of 243113322121 in words is "two hundred forty-three billion, one hundred thirteen million, three hundred twenty-two thousand, one hundred twenty-one".