2112021220 has 24 divisors (see below), whose sum is σ = 4451743800. Its totient is φ = 841665792.

The previous prime is 2112021217. The next prime is 2112021229. The reversal of 2112021220 is 221202112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8514724 + 2103506496 = 2918^2 + 45864^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2112021220.

It is not an unprimeable number, because it can be changed into a prime (2112021229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190905 + ... + 201664.

It is an arithmetic number, because the mean of its divisors is an integer number (185489325).

Almost surely, 2^2112021220 is an apocalyptic number.

2112021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2112021220 is an abundant number, since it is smaller than the sum of its proper divisors (2339722580).

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

2112021220 is a wasteful number, since it uses less digits than its factorization.

2112021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392847 (or 392845 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2112021220 is about 45956.7320422155. The cubic root of 2112021220 is about 1283.0180289460.

Adding to 2112021220 its reverse (221202112), we get a palindrome (2333223332).

The spelling of 2112021220 in words is "two billion, one hundred twelve million, twenty-one thousand, two hundred twenty".