2221112220 has 192 divisors, whose sum is σ = 6818878080. Its totient is φ = 537919488.

The previous prime is 2221112219. The next prime is 2221112249. The reversal of 2221112220 is 222111222.

2221112220 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 2221112220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8642332 + ... + 8642588.

It is an arithmetic number, because the mean of its divisors is an integer number (35514990).

Almost surely, 2^2221112220 is an apocalyptic number.

2221112220 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 2221112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3409439040).

2221112220 is an abundant number, since it is smaller than the sum of its proper divisors (4597765860).

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

2221112220 is a wasteful number, since it uses less digits than its factorization.

2221112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2221112220 is about 47128.6772570587. The cubic root of 2221112220 is about 1304.7385686141.

Adding to 2221112220 its reverse (222111222), we get a palindrome (2443223442).

The spelling of 2221112220 in words is "two billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty".