2121221220222 has 64 divisors (see below), whose sum is σ = 4735368046080. Its totient is φ = 628971848064.

The previous prime is 2121221220203. The next prime is 2121221220247. The reversal of 2121221220222 is 2220221221212.

It is a super-2 number, since 2×2121221220222² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 286503 + ... + 2079549.

It is an arithmetic number, because the mean of its divisors is an integer number (73990125720).

Almost surely, 2^{2121221220222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121221220222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2367684023040).

2121221220222 is an abundant number, since it is smaller than the sum of its proper divisors (2614146825858).

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

2121221220222 is a wasteful number, since it uses less digits than its factorization.

2121221220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793617.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 2121221220222 its reverse (2220221221212), we get a palindrome (4341442441434).

The spelling of 2121221220222 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-two".