243121235311 has 2 divisors, whose sum is σ = 243121235312. Its totient is φ = 243121235310.

The previous prime is 243121235299. The next prime is 243121235353. The reversal of 243121235311 is 113532121342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243121235311 - 2⁷ = 243121235183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243121235311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121235011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560617655 + 121560617656.

It is an arithmetic number, because the mean of its divisors is an integer number (121560617656).

Almost surely, 2^243121235311 is an apocalyptic number.

243121235311 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121235311 is an equidigital number, since it uses as much as digits as its factorization.

243121235311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

Adding to 243121235311 its reverse (113532121342), we get a palindrome (356653356653).

The spelling of 243121235311 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-five thousand, three hundred eleven".