2022221221 has 4 divisors (see below), whose sum is σ = 2022574444. Its totient is φ = 2021868000.

The previous prime is 2022221197. The next prime is 2022221231. The reversal of 2022221221 is 1221222202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1221222202 = 2 ⋅610611101.

It can be written as a sum of positive squares in 2 ways, for example, as 1718102500 + 304118721 = 41450^2 + 17439^2 .

It is a cyclic number.

It is not a de Polignac number, because 2022221221 - 2⁷ = 2022221093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2022221195 and 2022221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2022221231) 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, 167880 + ... + 179521.

It is an arithmetic number, because the mean of its divisors is an integer number (505643611).

Almost surely, 2^2022221221 is an apocalyptic number.

It is an amenable number.

2022221221 is a deficient number, since it is larger than the sum of its proper divisors (353223).

2022221221 is an equidigital number, since it uses as much as digits as its factorization.

2022221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353222.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2022221221 is about 44969.1140784428. The cubic root of 2022221221 is about 1264.5700384862.

Adding to 2022221221 its reverse (1221222202), we get a palindrome (3243443423).

The spelling of 2022221221 in words is "two billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".