222121221122220 has 768 divisors, whose sum is σ = 811804247654400. Its totient is φ = 44152451481600.

The previous prime is 222121221122197. The next prime is 222121221122249. The reversal of 222121221122220 is 22221122121222.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 4089172221 + ... + 4089226539.

It is an arithmetic number, because the mean of its divisors is an integer number (1057036780800).

Almost surely, 2^{222121221122220} is an apocalyptic number.

222121221122220 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 222121221122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405902123827200).

222121221122220 is an abundant number, since it is smaller than the sum of its proper divisors (589683026532180).

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

222121221122220 is a wasteful number, since it uses less digits than its factorization.

222121221122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55118 (or 55116 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 222121221122220 its reverse (22221122121222), we get a palindrome (244342343243442).

The spelling of 222121221122220 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty".