123221321 has 4 divisors (see below), whose sum is σ = 130469652. Its totient is φ = 115972992.

The previous prime is 123221297. The next prime is 123221341. The reversal of 123221321 is 123122321.

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 106090000 + 17131321 = 10300^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 123221321 - 2¹⁴ = 123204937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 7248313 = 123221321 / (1 + 2 + 3 + 2 + 2 + 1 + 3 + 2 + 1).

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 123221321.

It is not an unprimeable number, because it can be changed into a prime (123221341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3624140 + ... + 3624173.

It is an arithmetic number, because the mean of its divisors is an integer number (32617413).

Almost surely, 2^123221321 is an apocalyptic number.

It is an amenable number.

123221321 is a deficient number, since it is larger than the sum of its proper divisors (7248331).

123221321 is an equidigital number, since it uses as much as digits as its factorization.

123221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248330.

The product of its digits is 144, while the sum is 17.

The square root of 123221321 is about 11100.5099432413. The cubic root of 123221321 is about 497.6170895163.

Adding to 123221321 its reverse (123122321), we get a palindrome (246343642).

The spelling of 123221321 in words is "one hundred twenty-three million, two hundred twenty-one thousand, three hundred twenty-one".