221102222220 has 144 divisors (see below), whose sum is σ = 731901145248. Its totient is φ = 53581946880.

The previous prime is 221102222183. The next prime is 221102222227. The reversal of 221102222220 is 22222201122.

221102222220 is a `hidden beast` number, since 221 + 1 + 0 + 2 + 222 + 220 = 666.

221102222220 is digitally balanced in base 3, because in such base 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 (18).

It is a junction number, because it is equal to n+sod(n) for n = 221102222193 and 221102222202.

It is not an unprimeable number, because it can be changed into a prime (221102222227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6193462 + ... + 6229058.

It is an arithmetic number, because the mean of its divisors is an integer number (5082646842).

Almost surely, 2^221102222220 is an apocalyptic number.

221102222220 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 221102222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365950572624).

221102222220 is an abundant number, since it is smaller than the sum of its proper divisors (510798923028).

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

221102222220 is a wasteful number, since it uses less digits than its factorization.

221102222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38760 (or 38755 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221102222220 its reverse (22222201122), we get a palindrome (243324423342).

The spelling of 221102222220 in words is "two hundred twenty-one billion, one hundred two million, two hundred twenty-two thousand, two hundred twenty".