221122022220 has 72 divisors (see below), whose sum is σ = 731712880080. Its totient is φ = 53605338240.

The previous prime is 221122022213. The next prime is 221122022221. The reversal of 221122022220 is 22220221122.

221122022220 is a `hidden beast` number, since 221 + 1 + 220 + 2 + 2 + 220 = 666.

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 = 221122022193 and 221122022202.

It is not an unprimeable number, because it can be changed into a prime (221122022221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55836915 + ... + 55840874.

It is an arithmetic number, because the mean of its divisors is an integer number (10162678890).

Almost surely, 2^221122022220 is an apocalyptic number.

221122022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221122022220 is an abundant number, since it is smaller than the sum of its proper divisors (510590857860).

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

221122022220 is a wasteful number, since it uses less digits than its factorization.

221122022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111677815 (or 111677810 counting only the distinct ones).

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

Adding to 221122022220 its reverse (22220221122), we get a palindrome (243342243342).

The spelling of 221122022220 in words is "two hundred twenty-one billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty".