243121241213 has 2 divisors, whose sum is σ = 243121241214. Its totient is φ = 243121241212.

The previous prime is 243121241201. The next prime is 243121241221. The reversal of 243121241213 is 312142121342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197169745444 + 45951495769 = 444038^2 + 214363^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121241213 - 2⁶ = 243121241149 is a prime.

It is a super-2 number, since 2×243121241213² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121243213) 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 as a sum of consecutive naturals, namely, 121560620606 + 121560620607.

It is an arithmetic number, because the mean of its divisors is an integer number (121560620607).

Almost surely, 2^243121241213 is an apocalyptic number.

It is an amenable number.

243121241213 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121241213 is an equidigital number, since it uses as much as digits as its factorization.

243121241213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

Adding to 243121241213 its reverse (312142121342), we get a palindrome (555263362555).

The spelling of 243121241213 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-one thousand, two hundred thirteen".