43312307321 has 2 divisors, whose sum is σ = 43312307322. Its totient is φ = 43312307320.

The previous prime is 43312307317. The next prime is 43312307341. The reversal of 43312307321 is 12370321334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43249025296 + 63282025 = 207964^2 + 7955^2 .

It is a cyclic number.

It is not a de Polignac number, because 43312307321 - 2² = 43312307317 is a prime.

It is not a weakly prime, because it can be changed into another prime (43312307341) 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 as a sum of consecutive naturals, namely, 21656153660 + 21656153661.

It is an arithmetic number, because the mean of its divisors is an integer number (21656153661).

Almost surely, 2^43312307321 is an apocalyptic number.

It is an amenable number.

43312307321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43312307321 is an equidigital number, since it uses as much as digits as its factorization.

43312307321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 29.

Adding to 43312307321 its reverse (12370321334), we get a palindrome (55682628655).

The spelling of 43312307321 in words is "forty-three billion, three hundred twelve million, three hundred seven thousand, three hundred twenty-one".