1222230221 has 4 divisors (see below), whose sum is σ = 1242266844. Its totient is φ = 1202193600.

The previous prime is 1222230209. The next prime is 1222230223. The reversal of 1222230221 is 1220322221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220322221 = 157 ⋅7772753.

It can be written as a sum of positive squares in 2 ways, for example, as 605701321 + 616528900 = 24611^2 + 24830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222230221 - 2³⁰ = 148488397 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 1222230221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222230223) 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, 10018220 + ... + 10018341.

It is an arithmetic number, because the mean of its divisors is an integer number (310566711).

Almost surely, 2^1222230221 is an apocalyptic number.

It is an amenable number.

1222230221 is a deficient number, since it is larger than the sum of its proper divisors (20036623).

1222230221 is an equidigital number, since it uses as much as digits as its factorization.

1222230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20036622.

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

The square root of 1222230221 is about 34960.4093368484. The cubic root of 1222230221 is about 1069.1804423894.

Adding to 1222230221 its reverse (1220322221), we get a palindrome (2442552442).

The spelling of 1222230221 in words is "one billion, two hundred twenty-two million, two hundred thirty thousand, two hundred twenty-one".