243121235353 has 2 divisors, whose sum is σ = 243121235354. Its totient is φ = 243121235352.

The previous prime is 243121235311. The next prime is 243121235377. The reversal of 243121235353 is 353532121342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226812157504 + 16309077849 = 476248^2 + 127707^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121235353 - 2²¹ = 243119138201 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121235053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560617676 + 121560617677.

It is an arithmetic number, because the mean of its divisors is an integer number (121560617677).

Almost surely, 2^243121235353 is an apocalyptic number.

It is an amenable number.

243121235353 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121235353 is an equidigital number, since it uses as much as digits as its factorization.

243121235353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 34.

Adding to 243121235353 its reverse (353532121342), we get a palindrome (596653356695).

The spelling of 243121235353 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-five thousand, three hundred fifty-three".