3221213321 has 4 divisors (see below), whose sum is σ = 3224637444. Its totient is φ = 3217789200.

The previous prime is 3221213299. The next prime is 3221213327. The reversal of 3221213321 is 1233121223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1233121223 = 19 ⋅64901117.

It can be written as a sum of positive squares in 2 ways, for example, as 1501950025 + 1719263296 = 38755^2 + 41464^2 .

It is a cyclic number.

It is not a de Polignac number, because 3221213321 - 2¹⁸ = 3220951177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3221213293 and 3221213302.

It is not an unprimeable number, because it can be changed into a prime (3221213327) 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, 1710650 + ... + 1712531.

It is an arithmetic number, because the mean of its divisors is an integer number (806159361).

Almost surely, 2^3221213321 is an apocalyptic number.

It is an amenable number.

3221213321 is a deficient number, since it is larger than the sum of its proper divisors (3424123).

3221213321 is an equidigital number, since it uses as much as digits as its factorization.

3221213321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424122.

The product of its digits is 432, while the sum is 20.

The square root of 3221213321 is about 56755.7338160648. The cubic root of 3221213321 is about 1476.8617030005.

Adding to 3221213321 its reverse (1233121223), we get a palindrome (4454334544).

The spelling of 3221213321 in words is "three billion, two hundred twenty-one million, two hundred thirteen thousand, three hundred twenty-one".