243404003244221 has 4 divisors (see below), whose sum is σ = 243736068733692. Its totient is φ = 243071937754752.

The previous prime is 243404003244173. The next prime is 243404003244293. The reversal of 243404003244221 is 122442300404342.

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 224481598944100 + 18922404300121 = 14982710^2 + 4349989^2 .

It is a cyclic number.

It is not a de Polignac number, because 243404003244221 - 2²² = 243403999049917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243404003240221) 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, 166032743636 + ... + 166032745101.

It is an arithmetic number, because the mean of its divisors is an integer number (60934017183423).

Almost surely, 2^{243404003244221} is an apocalyptic number.

It is an amenable number.

243404003244221 is a deficient number, since it is larger than the sum of its proper divisors (332065489471).

243404003244221 is an equidigital number, since it uses as much as digits as its factorization.

243404003244221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332065489470.

The product of its (nonzero) digits is 147456, while the sum is 35.

Adding to 243404003244221 its reverse (122442300404342), we get a palindrome (365846303648563).

The spelling of 243404003244221 in words is "two hundred forty-three trillion, four hundred four billion, three million, two hundred forty-four thousand, two hundred twenty-one".