243430403221 has 4 divisors (see below), whose sum is σ = 243439616812. Its totient is φ = 243421189632.

The previous prime is 243430403173. The next prime is 243430403257. The reversal of 243430403221 is 122304034342.

243430403221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 136050322500 + 107380080721 = 368850^2 + 327689^2 .

It is a cyclic number.

It is not a de Polignac number, because 243430403221 - 2²⁹ = 242893532309 is a prime.

It is a super-2 number, since 2×243430403221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243430403221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243430403521) 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 3 ways as a sum of consecutive naturals, for example, 4567050 + ... + 4620043.

It is an arithmetic number, because the mean of its divisors is an integer number (60859904203).

Almost surely, 2^243430403221 is an apocalyptic number.

It is an amenable number.

243430403221 is a deficient number, since it is larger than the sum of its proper divisors (9213591).

243430403221 is an equidigital number, since it uses as much as digits as its factorization.

243430403221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9213590.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 243430403221 its reverse (122304034342), we get a palindrome (365734437563).

The spelling of 243430403221 in words is "two hundred forty-three billion, four hundred thirty million, four hundred three thousand, two hundred twenty-one".