221122110220 has 96 divisors (see below), whose sum is σ = 510831256320. Its totient is φ = 79734493440.

The previous prime is 221122110161. The next prime is 221122110229. The reversal of 221122110220 is 22011221122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221122110194 and 221122110203.

It is not an unprimeable number, because it can be changed into a prime (221122110229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13297071 + ... + 13313689.

It is an arithmetic number, because the mean of its divisors is an integer number (5321158920).

Almost surely, 2^221122110220 is an apocalyptic number.

221122110220 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 221122110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255415628160).

221122110220 is an abundant number, since it is smaller than the sum of its proper divisors (289709146100).

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

221122110220 is a wasteful number, since it uses less digits than its factorization.

221122110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17143 (or 17141 counting only the distinct ones).

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

Adding to 221122110220 its reverse (22011221122), we get a palindrome (243133331342).

It can be divided in two parts, 2211221102 and 20, that added together give a palindrome (2211221122).

The spelling of 221122110220 in words is "two hundred twenty-one billion, one hundred twenty-two million, one hundred ten thousand, two hundred twenty".