43432421 has 2 divisors, whose sum is σ = 43432422. Its totient is φ = 43432420.

The previous prime is 43432409. The next prime is 43432447. The reversal of 43432421 is 12423434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39551521 + 3880900 = 6289^2 + 1970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43432421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43432321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21716210 + 21716211.

It is an arithmetic number, because the mean of its divisors is an integer number (21716211).

Almost surely, 2^43432421 is an apocalyptic number.

It is an amenable number.

43432421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43432421 is an equidigital number, since it uses as much as digits as its factorization.

43432421 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 43432421 is about 6590.3278370655. The cubic root of 43432421 is about 351.5102655998.

Adding to 43432421 its reverse (12423434), we get a palindrome (55855855).

The spelling of 43432421 in words is "forty-three million, four hundred thirty-two thousand, four hundred twenty-one".