43868021 has 2 divisors, whose sum is σ = 43868022. Its totient is φ = 43868020.

The previous prime is 43868003. The next prime is 43868029. The reversal of 43868021 is 12086834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23716900 + 20151121 = 4870^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 43868021 - 2¹⁰ = 43866997 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 (43868029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21934010 + 21934011.

It is an arithmetic number, because the mean of its divisors is an integer number (21934011).

Almost surely, 2^43868021 is an apocalyptic number.

It is an amenable number.

43868021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43868021 is an equidigital number, since it uses as much as digits as its factorization.

43868021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 43868021 is about 6623.2938180334. The cubic root of 43868021 is about 352.6815013519.

The spelling of 43868021 in words is "forty-three million, eight hundred sixty-eight thousand, twenty-one".