243121235299 has 2 divisors, whose sum is σ = 243121235300. Its totient is φ = 243121235298.

The previous prime is 243121235213. The next prime is 243121235311. The reversal of 243121235299 is 992532121342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243121235299 - 2¹⁵ = 243121202531 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121235999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560617649 + 121560617650.

It is an arithmetic number, because the mean of its divisors is an integer number (121560617650).

Almost surely, 2^243121235299 is an apocalyptic number.

243121235299 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121235299 is an equidigital number, since it uses as much as digits as its factorization.

243121235299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The spelling of 243121235299 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-five thousand, two hundred ninety-nine".