43332221 has 2 divisors, whose sum is σ = 43332222. Its totient is φ = 43332220.

The previous prime is 43332209. The next prime is 43332229. The reversal of 43332221 is 12223334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 1406596 = 6475^2 + 1186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43332221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 43332193 and 43332202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43332229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21666110 + 21666111.

It is an arithmetic number, because the mean of its divisors is an integer number (21666111).

Almost surely, 2^43332221 is an apocalyptic number.

It is an amenable number.

43332221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43332221 is an equidigital number, since it uses as much as digits as its factorization.

43332221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 20.

The square root of 43332221 is about 6582.7213977199. The cubic root of 43332221 is about 351.2397422738.

Adding to 43332221 its reverse (12223334), we get a palindrome (55555555).

The spelling of 43332221 in words is "forty-three million, three hundred thirty-two thousand, two hundred twenty-one".