221022221112 has 96 divisors (see below), whose sum is σ = 746308817280. Its totient is φ = 57408367680.

The previous prime is 221022221099. The next prime is 221022221131. The reversal of 221022221112 is 211122220122.

It is a happy number.

221022221112 is a `hidden beast` number, since 221 + 0 + 222 + 211 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19927918 + ... + 19939005.

It is an arithmetic number, because the mean of its divisors is an integer number (7774050180).

Almost surely, 2^221022221112 is an apocalyptic number.

221022221112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221022221112 is an abundant number, since it is smaller than the sum of its proper divisors (525286596168).

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

221022221112 is a wasteful number, since it uses less digits than its factorization.

221022221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39866953 (or 39866946 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221022221112 its reverse (211122220122), we get a palindrome (432144441234).

The spelling of 221022221112 in words is "two hundred twenty-one billion, twenty-two million, two hundred twenty-one thousand, one hundred twelve".