43336421 has 2 divisors, whose sum is σ = 43336422. Its totient is φ = 43336420.

The previous prime is 43336367. The next prime is 43336441. The reversal of 43336421 is 12463334.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29311396 + 14025025 = 5414^2 + 3745^2 .

It is a cyclic number.

It is not a de Polignac number, because 43336421 - 2¹⁴ = 43320037 is a prime.

It is a Sophie Germain 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 (43336441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21668210 + 21668211.

It is an arithmetic number, because the mean of its divisors is an integer number (21668211).

Almost surely, 2^43336421 is an apocalyptic number.

It is an amenable number.

43336421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43336421 is an equidigital number, since it uses as much as digits as its factorization.

43336421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 26.

The square root of 43336421 is about 6583.0404069852. The cubic root of 43336421 is about 351.2510899440.

Adding to 43336421 its reverse (12463334), we get a palindrome (55799755).

The spelling of 43336421 in words is "forty-three million, three hundred thirty-six thousand, four hundred twenty-one".