243220204243 has 4 divisors (see below), whose sum is σ = 247207420768. Its totient is φ = 239232987720.

The previous prime is 243220204207. The next prime is 243220204259. The reversal of 243220204243 is 342402022342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342402022342 = 2 ⋅171201011171.

It is a cyclic number.

It is not a de Polignac number, because 243220204243 - 2¹⁷ = 243220073171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243220205243) 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, 1993608171 + ... + 1993608292.

It is an arithmetic number, because the mean of its divisors is an integer number (61801855192).

Almost surely, 2^243220204243 is an apocalyptic number.

243220204243 is a deficient number, since it is larger than the sum of its proper divisors (3987216525).

243220204243 is an equidigital number, since it uses as much as digits as its factorization.

243220204243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987216524.

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 243220204243 its reverse (342402022342), we get a palindrome (585622226585).

The spelling of 243220204243 in words is "two hundred forty-three billion, two hundred twenty million, two hundred four thousand, two hundred forty-three".