222122321 has 4 divisors (see below), whose sum is σ = 222676644. Its totient is φ = 221568000.

The previous prime is 222122309. The next prime is 222122333. The reversal of 222122321 is 123221222.

222122321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123221222 = 2 ⋅61610611.

It is an interprime number because it is at equal distance from previous prime (222122309) and next prime (222122333).

It can be written as a sum of positive squares in 2 ways, for example, as 196000000 + 26122321 = 14000^2 + 5111^2 .

It is a cyclic number.

It is not a de Polignac number, because 222122321 - 2¹⁰ = 222121297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222122321.

It is not an unprimeable number, because it can be changed into a prime (222112321) 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, 276560 + ... + 277361.

It is an arithmetic number, because the mean of its divisors is an integer number (55669161).

Almost surely, 2^222122321 is an apocalyptic number.

It is an amenable number.

222122321 is a deficient number, since it is larger than the sum of its proper divisors (554323).

222122321 is an equidigital number, since it uses as much as digits as its factorization.

222122321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554322.

The product of its digits is 192, while the sum is 17.

The square root of 222122321 is about 14903.7686844637. The cubic root of 222122321 is about 605.6160843884.

Adding to 222122321 its reverse (123221222), we get a palindrome (345343543).

It can be divided in two parts, 2221 and 22321, that added together give a palindrome (24542).

The spelling of 222122321 in words is "two hundred twenty-two million, one hundred twenty-two thousand, three hundred twenty-one".