2221222221220 has 192 divisors, whose sum is σ = 5131143521280. Its totient is φ = 804418560000.

The previous prime is 2221222221191. The next prime is 2221222221233. The reversal of 2221222221220 is 221222221222.

It is a junction number, because it is equal to n+sod(n) for n = 2221222221191 and 2221222221200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 224338270 + ... + 224348170.

It is an arithmetic number, because the mean of its divisors is an integer number (26724705840).

Almost surely, 2^{2221222221220} is an apocalyptic number.

2221222221220 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 2221222221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2565571760640).

2221222221220 is an abundant number, since it is smaller than the sum of its proper divisors (2909921300060).

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

2221222221220 is a wasteful number, since it uses less digits than its factorization.

2221222221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10214 (or 10212 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 2221222221220 its reverse (221222221222), we get a palindrome (2442444442442).

It can be divided in two parts, 2221222 and 221220, that added together give a palindrome (2442442).

The spelling of 2221222221220 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".