4043412221 has 2 divisors, whose sum is σ = 4043412222. Its totient is φ = 4043412220.

The previous prime is 4043412199. The next prime is 4043412223. The reversal of 4043412221 is 1222143404.

4043412221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3362724121 + 680688100 = 57989^2 + 26090^2 .

It is a cyclic number.

It is not a de Polignac number, because 4043412221 - 2¹⁸ = 4043150077 is a prime.

Together with 4043412223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4043412223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021706110 + 2021706111.

It is an arithmetic number, because the mean of its divisors is an integer number (2021706111).

Almost surely, 2^4043412221 is an apocalyptic number.

It is an amenable number.

4043412221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4043412221 is an equidigital number, since it uses as much as digits as its factorization.

4043412221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 4043412221 is about 63587.8307618683. The cubic root of 4043412221 is about 1593.1231180984.

Adding to 4043412221 its reverse (1222143404), we get a palindrome (5265555625).

The spelling of 4043412221 in words is "four billion, forty-three million, four hundred twelve thousand, two hundred twenty-one".