243340345231213 has 4 divisors (see below), whose sum is σ = 249275475602748. Its totient is φ = 237405214859680.

The previous prime is 243340345231177. The next prime is 243340345231229. The reversal of 243340345231213 is 312132543043342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11246485402084 + 232093859829129 = 3353578^2 + 15234627^2 .

It is a cyclic number.

It is not a de Polignac number, because 243340345231213 - 2²¹ = 243340343134061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243340345231253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2967565185706 + ... + 2967565185787.

It is an arithmetic number, because the mean of its divisors is an integer number (62318868900687).

Almost surely, 2^{243340345231213} is an apocalyptic number.

It is an amenable number.

243340345231213 is a deficient number, since it is larger than the sum of its proper divisors (5935130371535).

243340345231213 is an equidigital number, since it uses as much as digits as its factorization.

243340345231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5935130371534.

The product of its (nonzero) digits is 622080, while the sum is 40.

Adding to 243340345231213 its reverse (312132543043342), we get a palindrome (555472888274555).

The spelling of 243340345231213 in words is "two hundred forty-three trillion, three hundred forty billion, three hundred forty-five million, two hundred thirty-one thousand, two hundred thirteen".