1323222221 has 8 divisors (see below), whose sum is σ = 1349815320. Its totient is φ = 1296689472.

The previous prime is 1323222209. The next prime is 1323222247. The reversal of 1323222221 is 1222223231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 116424100 + 1206798121 = 10790^2 + 34739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1323222221 is a prime.

It is a super-2 number, since 2×1323222221² = 3501834092296345682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323222193 and 1323222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323252221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30575 + ... + 59843.

It is an arithmetic number, because the mean of its divisors is an integer number (168726915).

Almost surely, 2^1323222221 is an apocalyptic number.

It is an amenable number.

1323222221 is a deficient number, since it is larger than the sum of its proper divisors (26593099).

1323222221 is an equidigital number, since it uses as much as digits as its factorization.

1323222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30175.

The product of its digits is 576, while the sum is 20.

The square root of 1323222221 is about 36376.1215772105. The cubic root of 1323222221 is about 1097.8531740084.

Adding to 1323222221 its reverse (1222223231), we get a palindrome (2545445452).

It can be divided in two parts, 13232 and 22221, that added together give a palindrome (35453).

The spelling of 1323222221 in words is "one billion, three hundred twenty-three million, two hundred twenty-two thousand, two hundred twenty-one".