43424321 has 2 divisors, whose sum is σ = 43424322. Its totient is φ = 43424320.

The previous prime is 43424279. The next prime is 43424323. The reversal of 43424321 is 12342434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 2002225 = 6436^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 43424321 - 2¹⁰ = 43423297 is a prime.

It is a super-2 number, since 2×43424321² = 3771343308622082, which contains 22 as substring.

Together with 43424323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43424323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21712160 + 21712161.

It is an arithmetic number, because the mean of its divisors is an integer number (21712161).

Almost surely, 2^43424321 is an apocalyptic number.

It is an amenable number.

43424321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43424321 is an equidigital number, since it uses as much as digits as its factorization.

43424321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 23.

The square root of 43424321 is about 6589.7132714557. The cubic root of 43424321 is about 351.4884124150.

Adding to 43424321 its reverse (12342434), we get a palindrome (55766755).

The spelling of 43424321 in words is "forty-three million, four hundred twenty-four thousand, three hundred twenty-one".