43103821 has 2 divisors, whose sum is σ = 43103822. Its totient is φ = 43103820.

The previous prime is 43103803. The next prime is 43103849. The reversal of 43103821 is 12830134.

43103821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29041321 + 14062500 = 5389^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 43103821 - 2¹⁵ = 43071053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43103792 and 43103801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43103861) 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, 21551910 + 21551911.

It is an arithmetic number, because the mean of its divisors is an integer number (21551911).

Almost surely, 2^43103821 is an apocalyptic number.

It is an amenable number.

43103821 is a deficient number, since it is larger than the sum of its proper divisors (1).

43103821 is an equidigital number, since it uses as much as digits as its factorization.

43103821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 43103821 is about 6565.3500287494. The cubic root of 43103821 is about 350.6215377829.

Adding to 43103821 its reverse (12830134), we get a palindrome (55933955).

The spelling of 43103821 in words is "forty-three million, one hundred three thousand, eight hundred twenty-one".