43321342391 has 2 divisors, whose sum is σ = 43321342392. Its totient is φ = 43321342390.

The previous prime is 43321342297. The next prime is 43321342487. The reversal of 43321342391 is 19324312334.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43321342391 - 2¹⁴ = 43321326007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43321342091) 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, 21660671195 + 21660671196.

It is an arithmetic number, because the mean of its divisors is an integer number (21660671196).

Almost surely, 2^43321342391 is an apocalyptic number.

43321342391 is a deficient number, since it is larger than the sum of its proper divisors (1).

43321342391 is an equidigital number, since it uses as much as digits as its factorization.

43321342391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 35.

The spelling of 43321342391 in words is "forty-three billion, three hundred twenty-one million, three hundred forty-two thousand, three hundred ninety-one".