3221131221 has 48 divisors (see below), whose sum is σ = 5807393280. Its totient is φ = 1671420960.

The previous prime is 3221131201. The next prime is 3221131223. The reversal of 3221131221 is 1221311223.

3221131221 is a `hidden beast` number, since 322 + 11 + 312 + 21 = 666.

It is not a de Polignac number, because 3221131221 - 2⁵ = 3221131189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3221131194 and 3221131203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221131223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 776170 + ... + 780308.

It is an arithmetic number, because the mean of its divisors is an integer number (120987360).

Almost surely, 2^3221131221 is an apocalyptic number.

It is an amenable number.

3221131221 is a deficient number, since it is larger than the sum of its proper divisors (2586262059).

3221131221 is a wasteful number, since it uses less digits than its factorization.

3221131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286 (or 5283 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 3221131221 is about 56755.0105365156. The cubic root of 3221131221 is about 1476.8491558261.

Adding to 3221131221 its reverse (1221311223), we get a palindrome (4442442444).

The spelling of 3221131221 in words is "three billion, two hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-one".