1321100111 has 4 divisors (see below), whose sum is σ = 1349208672. Its totient is φ = 1292991552.

The previous prime is 1321100087. The next prime is 1321100113. The reversal of 1321100111 is 1110011231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321100111 - 2⁶ = 1321100047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321100092 and 1321100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321100113) 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 3 ways as a sum of consecutive naturals, for example, 14054210 + ... + 14054303.

It is an arithmetic number, because the mean of its divisors is an integer number (337302168).

Almost surely, 2^1321100111 is an apocalyptic number.

1321100111 is a deficient number, since it is larger than the sum of its proper divisors (28108561).

1321100111 is an equidigital number, since it uses as much as digits as its factorization.

1321100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28108560.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1321100111 is about 36346.9408754024. The cubic root of 1321100111 is about 1097.2659680898.

Adding to 1321100111 its reverse (1110011231), we get a palindrome (2431111342).

The spelling of 1321100111 in words is "one billion, three hundred twenty-one million, one hundred thousand, one hundred eleven".