3031221220 has 24 divisors (see below), whose sum is σ = 6368161464. Its totient is φ = 1211993856.

The previous prime is 3031221217. The next prime is 3031221241. The reversal of 3031221220 is 221221303.

3031221220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 280428516 + 2750792704 = 16746^2 + 52448^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3031221194 and 3031221203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21504 + ... + 80776.

It is an arithmetic number, because the mean of its divisors is an integer number (265340061).

Almost surely, 2^3031221220 is an apocalyptic number.

It is an amenable number.

3031221220 is an abundant number, since it is smaller than the sum of its proper divisors (3336940244).

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

3031221220 is a wasteful number, since it uses less digits than its factorization.

3031221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61839 (or 61837 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 3031221220 is about 55056.5274967465. The cubic root of 3031221220 is about 1447.2355127597.

Adding to 3031221220 its reverse (221221303), we get a palindrome (3252442523).

The spelling of 3031221220 in words is "three billion, thirty-one million, two hundred twenty-one thousand, two hundred twenty".