43421069 has 2 divisors, whose sum is σ = 43421070. Its totient is φ = 43421068.

The previous prime is 43421047. The next prime is 43421071. The reversal of 43421069 is 96012434.

43421069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43072969 + 348100 = 6563^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 43421069 - 2⁸ = 43420813 is a prime.

It is a super-2 number, since 2×43421069² = 3770778466205522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 43421071, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43421039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710534 + 21710535.

It is an arithmetic number, because the mean of its divisors is an integer number (21710535).

Almost surely, 2^43421069 is an apocalyptic number.

It is an amenable number.

43421069 is a deficient number, since it is larger than the sum of its proper divisors (1).

43421069 is an equidigital number, since it uses as much as digits as its factorization.

43421069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 43421069 is about 6589.4665186189. The cubic root of 43421069 is about 351.4796380015.

The spelling of 43421069 in words is "forty-three million, four hundred twenty-one thousand, sixty-nine".