3211223221 has 2 divisors, whose sum is σ = 3211223222. Its totient is φ = 3211223220.

The previous prime is 3211223219. The next prime is 3211223233. The reversal of 3211223221 is 1223221123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2498600196 + 712623025 = 49986^2 + 26695^2 .

It is a cyclic number.

It is not a de Polignac number, because 3211223221 - 2¹ = 3211223219 is a prime.

It is a super-2 number, since 2×3211223221² = 20623909150179229682, which contains 22 as substring.

Together with 3211223219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3211223291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605611610 + 1605611611.

It is an arithmetic number, because the mean of its divisors is an integer number (1605611611).

Almost surely, 2^3211223221 is an apocalyptic number.

It is an amenable number.

3211223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3211223221 is an equidigital number, since it uses as much as digits as its factorization.

3211223221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 3211223221 is about 56667.6558629347. The cubic root of 3211223221 is about 1475.3333684486. Note that the first 4 decimals are identical.

Adding to 3211223221 its reverse (1223221123), we get a palindrome (4434444344).

The spelling of 3211223221 in words is "three billion, two hundred eleven million, two hundred twenty-three thousand, two hundred twenty-one".