3243213221 has 4 divisors (see below), whose sum is σ = 3274700832. Its totient is φ = 3211725612.

The previous prime is 3243213203. The next prime is 3243213223. The reversal of 3243213221 is 1223123423.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1223123423 = 19 ⋅64374917.

It is a cyclic number.

It is not a de Polignac number, because 3243213221 - 2¹⁰ = 3243212197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3243213223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15743651 + ... + 15743856.

It is an arithmetic number, because the mean of its divisors is an integer number (818675208).

Almost surely, 2^3243213221 is an apocalyptic number.

It is an amenable number.

3243213221 is a deficient number, since it is larger than the sum of its proper divisors (31487611).

3243213221 is a wasteful number, since it uses less digits than its factorization.

3243213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31487610.

The product of its digits is 1728, while the sum is 23.

The square root of 3243213221 is about 56949.2161579069. The cubic root of 3243213221 is about 1480.2162486852.

Adding to 3243213221 its reverse (1223123423), we get a palindrome (4466336644).

The spelling of 3243213221 in words is "three billion, two hundred forty-three million, two hundred thirteen thousand, two hundred twenty-one".