2311221220 has 72 divisors (see below), whose sum is σ = 6159283200. Its totient is φ = 720377280.

The previous prime is 2311221167. The next prime is 2311221221. The reversal of 2311221220 is 221221132.

It is a happy number.

2311221220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2311221194 and 2311221203.

It is not an unprimeable number, because it can be changed into a prime (2311221221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96420 + ... + 117979.

It is an arithmetic number, because the mean of its divisors is an integer number (85545600).

Almost surely, 2^2311221220 is an apocalyptic number.

2311221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2311221220 is an abundant number, since it is smaller than the sum of its proper divisors (3848061980).

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

2311221220 is a wasteful number, since it uses less digits than its factorization.

2311221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214433 (or 214424 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2311221220 is about 48075.1621942142. The cubic root of 2311221220 is about 1322.1493182923.

Adding to 2311221220 its reverse (221221132), we get a palindrome (2532442352).

The spelling of 2311221220 in words is "two billion, three hundred eleven million, two hundred twenty-one thousand, two hundred twenty".