3243543221 has 2 divisors, whose sum is σ = 3243543222. Its totient is φ = 3243543220.

The previous prime is 3243543167. The next prime is 3243543229. The reversal of 3243543221 is 1223453423.

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., 2688422500 + 555120721 = 51850^2 + 23561^2 .

It is a cyclic number.

It is not a de Polignac number, because 3243543221 - 2⁶ = 3243543157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3243543229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1621771610 + 1621771611.

It is an arithmetic number, because the mean of its divisors is an integer number (1621771611).

Almost surely, 2^3243543221 is an apocalyptic number.

It is an amenable number.

3243543221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3243543221 is an equidigital number, since it uses as much as digits as its factorization.

3243543221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 29.

The square root of 3243543221 is about 56952.1134024015. The cubic root of 3243543221 is about 1480.2664514483.

Adding to 3243543221 its reverse (1223453423), we get a palindrome (4466996644).

The spelling of 3243543221 in words is "three billion, two hundred forty-three million, five hundred forty-three thousand, two hundred twenty-one".