3221211312 has 120 divisors (see below), whose sum is σ = 9850351680. Its totient is φ = 974547840.

The previous prime is 3221211307. The next prime is 3221211347. The reversal of 3221211312 is 2131121223.

It is a super-2 number, since 2×3221211312² = 20752404633113522688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1308739 + ... + 1311197.

It is an arithmetic number, because the mean of its divisors is an integer number (82086264).

Almost surely, 2^3221211312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3221211312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4925175840).

3221211312 is an abundant number, since it is smaller than the sum of its proper divisors (6629140368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3221211312 is a wasteful number, since it uses less digits than its factorization.

3221211312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311 (or 3302 counting only the distinct ones).

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

The square root of 3221211312 is about 56755.7161174097. The cubic root of 3221211312 is about 1476.8613959717.

Adding to 3221211312 its reverse (2131121223), we get a palindrome (5352332535).

The spelling of 3221211312 in words is "three billion, two hundred twenty-one million, two hundred eleven thousand, three hundred twelve".