1321323111 has 20 divisors (see below), whose sum is σ = 1998823200. Its totient is φ = 869727456.

The previous prime is 1321323097. The next prime is 1321323119. The reversal of 1321323111 is 1113231231.

1321323111 is a `hidden beast` number, since 1 + 321 + 32 + 311 + 1 = 666.

1321323111 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1321323111 - 2⁷ = 1321322983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321323119) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 96846 + ... + 109643.

It is an arithmetic number, because the mean of its divisors is an integer number (99941160).

Almost surely, 2^1321323111 is an apocalyptic number.

1321323111 is a deficient number, since it is larger than the sum of its proper divisors (677500089).

1321323111 is an equidigital number, since it uses as much as digits as its factorization.

1321323111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206580 (or 206571 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1321323111 is about 36350.0084044007. The cubic root of 1321323111 is about 1097.3277036445.

Adding to 1321323111 its reverse (1113231231), we get a palindrome (2434554342).

The spelling of 1321323111 in words is "one billion, three hundred twenty-one million, three hundred twenty-three thousand, one hundred eleven".