243042403221 has 12 divisors (see below), whose sum is σ = 351592363980. Its totient is φ = 161783138880.

The previous prime is 243042403217. The next prime is 243042403229. The reversal of 243042403221 is 122304240342.

243042403221 is a `hidden beast` number, since 2 + 4 + 30 + 4 + 2 + 403 + 221 = 666.

243042403221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 74589618321 + 168452784900 = 273111^2 + 410430^2 .

It is not a de Polignac number, because 243042403221 - 2² = 243042403217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243042403229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20421216 + ... + 20433113.

It is an arithmetic number, because the mean of its divisors is an integer number (29299363665).

Almost surely, 2^243042403221 is an apocalyptic number.

It is an amenable number.

243042403221 is a deficient number, since it is larger than the sum of its proper divisors (108549960759).

243042403221 is a wasteful number, since it uses less digits than its factorization.

243042403221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40854996 (or 40854993 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 243042403221 its reverse (122304240342), we get a palindrome (365346643563).

The spelling of 243042403221 in words is "two hundred forty-three billion, forty-two million, four hundred three thousand, two hundred twenty-one".