2221221112 has 64 divisors (see below), whose sum is σ = 4619462400. Its totient is φ = 992893440.

The previous prime is 2221221103. The next prime is 2221221127. The reversal of 2221221112 is 2111221222.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1381413 + ... + 1383019.

It is an arithmetic number, because the mean of its divisors is an integer number (72179100).

Almost surely, 2^2221221112 is an apocalyptic number.

2221221112 is a gapful number since it is divisible by the number (22) 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 2221221112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2309731200).

2221221112 is an abundant number, since it is smaller than the sum of its proper divisors (2398241288).

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

2221221112 is a wasteful number, since it uses less digits than its factorization.

2221221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876 (or 1872 counting only the distinct ones).

The product of its digits is 64, while the sum is 16.

The square root of 2221221112 is about 47129.8325055373. The cubic root of 2221221112 is about 1304.7598902548.

Adding to 2221221112 its reverse (2111221222), we get a palindrome (4332442334).

The spelling of 2221221112 in words is "two billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twelve".