243232213321 has 2 divisors, whose sum is σ = 243232213322. Its totient is φ = 243232213320.

The previous prime is 243232213307. The next prime is 243232213331. The reversal of 243232213321 is 123312232342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172229150025 + 71003063296 = 415005^2 + 266464^2 .

It is a cyclic number.

It is not a de Polignac number, because 243232213321 - 2⁷ = 243232213193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243232213321.

It is not a weakly prime, because it can be changed into another prime (243232213331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121616106660 + 121616106661.

It is an arithmetic number, because the mean of its divisors is an integer number (121616106661).

Almost surely, 2^243232213321 is an apocalyptic number.

It is an amenable number.

243232213321 is a deficient number, since it is larger than the sum of its proper divisors (1).

243232213321 is an equidigital number, since it uses as much as digits as its factorization.

243232213321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 28.

Adding to 243232213321 its reverse (123312232342), we get a palindrome (366544445663).

The spelling of 243232213321 in words is "two hundred forty-three billion, two hundred thirty-two million, two hundred thirteen thousand, three hundred twenty-one".