221220112112 has 80 divisors (see below), whose sum is σ = 472516899840. Its totient is φ = 99978928896.

The previous prime is 221220112103. The next prime is 221220112151. The reversal of 221220112112 is 211211022122.

221220112112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281063 + ... + 722105.

It is an arithmetic number, because the mean of its divisors is an integer number (5906461248).

Almost surely, 2^221220112112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221220112112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236258449920).

221220112112 is an abundant number, since it is smaller than the sum of its proper divisors (251296787728).

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

221220112112 is a wasteful number, since it uses less digits than its factorization.

221220112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441150 (or 441144 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221220112112 its reverse (211211022122), we get a palindrome (432431134234).

The spelling of 221220112112 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, one hundred twelve".