1123220321 has 4 divisors (see below), whose sum is σ = 1182337200. Its totient is φ = 1064103444.

The previous prime is 1123220291. The next prime is 1123220353. The reversal of 1123220321 is 1230223211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1230223211 = 7 ⋅175746173.

It is a cyclic number.

It is not a de Polignac number, because 1123220321 - 2¹⁴ = 1123203937 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 1123220321.

It is not an unprimeable number, because it can be changed into a prime (1123220221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29558411 + ... + 29558448.

It is an arithmetic number, because the mean of its divisors is an integer number (295584300).

Almost surely, 2^1123220321 is an apocalyptic number.

It is an amenable number.

1123220321 is a deficient number, since it is larger than the sum of its proper divisors (59116879).

1123220321 is an equidigital number, since it uses as much as digits as its factorization.

1123220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59116878.

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

The square root of 1123220321 is about 33514.4792738900. The cubic root of 1123220321 is about 1039.4931951907.

Adding to 1123220321 its reverse (1230223211), we get a palindrome (2353443532).

The spelling of 1123220321 in words is "one billion, one hundred twenty-three million, two hundred twenty thousand, three hundred twenty-one".