1323111121 has 4 divisors (see below), whose sum is σ = 1324084644. Its totient is φ = 1322137600.

The previous prime is 1323111103. The next prime is 1323111131. The reversal of 1323111121 is 1211113231.

It is a happy number.

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 879419025 + 443692096 = 29655^2 + 21064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323111121 - 2¹⁹ = 1322586833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323111095 and 1323111104.

It is not an unprimeable number, because it can be changed into a prime (1323111131) 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, 484720 + ... + 487441.

It is an arithmetic number, because the mean of its divisors is an integer number (331021161).

Almost surely, 2^1323111121 is an apocalyptic number.

It is an amenable number.

1323111121 is a deficient number, since it is larger than the sum of its proper divisors (973523).

1323111121 is an equidigital number, since it uses as much as digits as its factorization.

1323111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973522.

The product of its digits is 36, while the sum is 16.

The square root of 1323111121 is about 36374.5944444746. The cubic root of 1323111121 is about 1097.8224472719.

Adding to 1323111121 its reverse (1211113231), we get a palindrome (2534224352).

The spelling of 1323111121 in words is "one billion, three hundred twenty-three million, one hundred eleven thousand, one hundred twenty-one".