3221220 has 48 divisors (see below), whose sum is σ = 9269568. Its totient is φ = 835200.

The previous prime is 3221189. The next prime is 3221237. The reversal of 3221220 is 221223.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 3221196 and 3221205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1495 + ... + 2945.

It is an arithmetic number, because the mean of its divisors is an integer number (193116).

Almost surely, 2^3221220 is an apocalyptic number.

3221220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4634784).

3221220 is an abundant number, since it is smaller than the sum of its proper divisors (6048348).

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

3221220 is a wasteful number, since it uses less digits than its factorization.

3221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 3221220 is about 1794.7757520091. The cubic root of 3221220 is about 147.6862723729.

Adding to 3221220 its reverse (221223), we get a palindrome (3442443).

The spelling of 3221220 in words is "three million, two hundred twenty-one thousand, two hundred twenty".