243303004421 has 2 divisors, whose sum is σ = 243303004422. Its totient is φ = 243303004420.

The previous prime is 243303004393. The next prime is 243303004457. The reversal of 243303004421 is 124400303342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146279476225 + 97023528196 = 382465^2 + 311486^2 .

It is a cyclic number.

It is not a de Polignac number, because 243303004421 - 2³⁴ = 226123135237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243303004621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121651502210 + 121651502211.

It is an arithmetic number, because the mean of its divisors is an integer number (121651502211).

Almost surely, 2^243303004421 is an apocalyptic number.

It is an amenable number.

243303004421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243303004421 is an equidigital number, since it uses as much as digits as its factorization.

243303004421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 243303004421 its reverse (124400303342), we get a palindrome (367703307763).

The spelling of 243303004421 in words is "two hundred forty-three billion, three hundred three million, four thousand, four hundred twenty-one".