1321120111 has 2 divisors, whose sum is σ = 1321120112. Its totient is φ = 1321120110.

The previous prime is 1321120109. The next prime is 1321120139. The reversal of 1321120111 is 1110211231.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321120111 - 2¹ = 1321120109 is a prime.

Together with 1321120109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1321120091 and 1321120100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321120511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660560055 + 660560056.

It is an arithmetic number, because the mean of its divisors is an integer number (660560056).

Almost surely, 2^1321120111 is an apocalyptic number.

1321120111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321120111 is an equidigital number, since it uses as much as digits as its factorization.

1321120111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1321120111 is about 36347.2160006788. The cubic root of 1321120111 is about 1097.2715051945.

Adding to 1321120111 its reverse (1110211231), we get a palindrome (2431331342).

It can be divided in two parts, 1321120 and 111, that added together give a palindrome (1321231).

The spelling of 1321120111 in words is "one billion, three hundred twenty-one million, one hundred twenty thousand, one hundred eleven".