1223020321 has 4 divisors (see below), whose sum is σ = 1223176192. Its totient is φ = 1222864452.

The previous prime is 1223020303. The next prime is 1223020361. The reversal of 1223020321 is 1230203221.

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.

It is a cyclic number.

It is not a de Polignac number, because 1223020321 - 2²³ = 1214631713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223020295 and 1223020304.

It is not an unprimeable number, because it can be changed into a prime (1223020301) 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, 65505 + ... + 82078.

It is an arithmetic number, because the mean of its divisors is an integer number (305794048).

Almost surely, 2^1223020321 is an apocalyptic number.

It is an amenable number.

1223020321 is a deficient number, since it is larger than the sum of its proper divisors (155871).

1223020321 is an equidigital number, since it uses as much as digits as its factorization.

1223020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155870.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1223020321 is about 34971.7074361547. The cubic root of 1223020321 is about 1069.4107802011.

Adding to 1223020321 its reverse (1230203221), we get a palindrome (2453223542).

It can be divided in two parts, 1 and 223020321, that added together give a palindrome (223020322).

The spelling of 1223020321 in words is "one billion, two hundred twenty-three million, twenty thousand, three hundred twenty-one".