1321320223 has 16 divisors (see below), whose sum is σ = 1446232320. Its totient is φ = 1203018240.

The previous prime is 1321320179. The next prime is 1321320227. The reversal of 1321320223 is 3220231231.

It is not a de Polignac number, because 1321320223 - 2¹⁷ = 1321189151 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 1321320223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321320227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505143 + ... + 507751.

It is an arithmetic number, because the mean of its divisors is an integer number (90389520).

Almost surely, 2^1321320223 is an apocalyptic number.

1321320223 is a deficient number, since it is larger than the sum of its proper divisors (124912097).

1321320223 is an frugal number, since it uses more digits than its factorization.

1321320223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719 (or 2657 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1321320223 is about 36349.9686794913. The cubic root of 1321320223 is about 1097.3269041719.

Adding to 1321320223 its reverse (3220231231), we get a palindrome (4541551454).

It can be divided in two parts, 13213202 and 23, that added together give a square (13213225 = 3635²).

The spelling of 1321320223 in words is "one billion, three hundred twenty-one million, three hundred twenty thousand, two hundred twenty-three".