221122233220 has 96 divisors (see below), whose sum is σ = 555412935168. Its totient is φ = 72301565952.

The previous prime is 221122233203. The next prime is 221122233239. The reversal of 221122233220 is 22332221122.

It is a junction number, because it is equal to n+sod(n) for n = 221122233191 and 221122233200.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 983254 + ... + 1187026.

It is an arithmetic number, because the mean of its divisors is an integer number (5785551408).

Almost surely, 2^221122233220 is an apocalyptic number.

221122233220 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 221122233220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277706467584).

221122233220 is an abundant number, since it is smaller than the sum of its proper divisors (334290701948).

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

221122233220 is a wasteful number, since it uses less digits than its factorization.

221122233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204149 (or 204147 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 221122233220 its reverse (22332221122), we get a palindrome (243454454342).

The spelling of 221122233220 in words is "two hundred twenty-one billion, one hundred twenty-two million, two hundred thirty-three thousand, two hundred twenty".