1323221011 has 4 divisors (see below), whose sum is σ = 1512252592. Its totient is φ = 1134189432.

The previous prime is 1323220991. The next prime is 1323221017. The reversal of 1323221011 is 1101223231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1101223231 = 241 ⋅4569391.

It is a cyclic number.

It is not a de Polignac number, because 1323221011 - 2⁵ = 1323220979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1323221017) 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, 94515780 + ... + 94515793.

It is an arithmetic number, because the mean of its divisors is an integer number (378063148).

Almost surely, 2^1323221011 is an apocalyptic number.

1323221011 is a deficient number, since it is larger than the sum of its proper divisors (189031581).

1323221011 is an equidigital number, since it uses as much as digits as its factorization.

1323221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189031580.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1323221011 is about 36376.1049454171. The cubic root of 1323221011 is about 1097.8528393700.

Adding to 1323221011 its reverse (1101223231), we get a palindrome (2424444242).

It can be divided in two parts, 13232 and 21011, that added together give a palindrome (34243).

The spelling of 1323221011 in words is "one billion, three hundred twenty-three million, two hundred twenty-one thousand, eleven".