3211222221 has 12 divisors (see below), whose sum is σ = 4639508380. Its totient is φ = 2140318080.

The previous prime is 3211222181. The next prime is 3211222277. The reversal of 3211222221 is 1222221123.

3211222221 is a `hidden beast` number, since 321 + 122 + 2 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1748159721 + 1463062500 = 41811^2 + 38250^2 .

It is not a de Polignac number, because 3211222221 - 2¹⁰ = 3211221197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3211222194 and 3211222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3211222121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1935 + ... + 80163.

Almost surely, 2^3211222221 is an apocalyptic number.

It is an amenable number.

3211222221 is a deficient number, since it is larger than the sum of its proper divisors (1428286159).

3211222221 is a wasteful number, since it uses less digits than its factorization.

3211222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82796 (or 82793 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 3211222221 is about 56667.6470395586. The cubic root of 3211222221 is about 1475.3332153051. Note that the first 3 decimals are identical.

Adding to 3211222221 its reverse (1222221123), we get a palindrome (4433443344).

The spelling of 3211222221 in words is "three billion, two hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".