43041421 has 2 divisors, whose sum is σ = 43041422. Its totient is φ = 43041420.

The previous prime is 43041377. The next prime is 43041451. The reversal of 43041421 is 12414034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35832196 + 7209225 = 5986^2 + 2685^2 .

It is a cyclic number.

It is not a de Polignac number, because 43041421 - 2⁷ = 43041293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43041451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21520710 + 21520711.

It is an arithmetic number, because the mean of its divisors is an integer number (21520711).

Almost surely, 2^43041421 is an apocalyptic number.

It is an amenable number.

43041421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43041421 is an equidigital number, since it uses as much as digits as its factorization.

43041421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 43041421 is about 6560.5960857227. The cubic root of 43041421 is about 350.4522616052.

Adding to 43041421 its reverse (12414034), we get a palindrome (55455455).

The spelling of 43041421 in words is "forty-three million, forty-one thousand, four hundred twenty-one".