2222021222221 has 4 divisors (see below), whose sum is σ = 2244021432444. Its totient is φ = 2200021012000.

The previous prime is 2222021222209. The next prime is 2222021222227. The reversal of 2222021222221 is 1222221202222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1384587589225 + 837433632996 = 1176685^2 + 915114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222021222221 - 2⁷ = 2222021222093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2222021222192 and 2222021222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222021222227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11000104960 + ... + 11000105161.

It is an arithmetic number, because the mean of its divisors is an integer number (561005358111).

Almost surely, 2^{2222021222221} is an apocalyptic number.

It is an amenable number.

2222021222221 is a deficient number, since it is larger than the sum of its proper divisors (22000210223).

2222021222221 is a wasteful number, since it uses less digits than its factorization.

2222021222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22000210222.

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

Adding to 2222021222221 its reverse (1222221202222), we get a palindrome (3444242424443).

The spelling of 2222021222221 in words is "two trillion, two hundred twenty-two billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".