3221201220 has 48 divisors (see below), whose sum is σ = 9112363008. Its totient is φ = 850129920.

The previous prime is 3221201209. The next prime is 3221201239. The reversal of 3221201220 is 221021223.

It is a happy number.

It is a super-2 number, since 2×3221201220² = 20752274599458976800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 3221201220.

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, 270916 + ... + 282555.

It is an arithmetic number, because the mean of its divisors is an integer number (189840896).

Almost surely, 2^3221201220 is an apocalyptic number.

3221201220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3221201220 is an abundant number, since it is smaller than the sum of its proper divisors (5891161788).

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

3221201220 is a wasteful number, since it uses less digits than its factorization.

3221201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553580 (or 553578 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 3221201220 is about 56755.6272099957. The cubic root of 3221201220 is about 1476.8598536429.

Adding to 3221201220 its reverse (221021223), we get a palindrome (3442222443).

The spelling of 3221201220 in words is "three billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty".