2121110220 has 96 divisors (see below), whose sum is σ = 6310483200. Its totient is φ = 530820864.

The previous prime is 2121110219. The next prime is 2121110237. The reversal of 2121110220 is 220111212.

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 = 2121110196 and 2121110205.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113286 + ... + 130674.

It is an arithmetic number, because the mean of its divisors is an integer number (65734200).

Almost surely, 2^2121110220 is an apocalyptic number.

2121110220 is a gapful number since it is divisible by the number (20) 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 2121110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3155241600).

2121110220 is an abundant number, since it is smaller than the sum of its proper divisors (4189372980).

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

2121110220 is a wasteful number, since it uses less digits than its factorization.

2121110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17527 (or 17525 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2121110220 is about 46055.5123736562. The cubic root of 2121110220 is about 1284.8558675970.

Adding to 2121110220 its reverse (220111212), we get a palindrome (2341221432).

The spelling of 2121110220 in words is "two billion, one hundred twenty-one million, one hundred ten thousand, two hundred twenty".