111112321 has 2 divisors, whose sum is σ = 111112322. Its totient is φ = 111112320.

The previous prime is 111112319. The next prime is 111112409. The reversal of 111112321 is 123211111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101284096 + 9828225 = 10064^2 + 3135^2 .

It is a cyclic number.

It is not a de Polignac number, because 111112321 - 2¹ = 111112319 is a prime.

Together with 111112319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111112121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55556160 + 55556161.

It is an arithmetic number, because the mean of its divisors is an integer number (55556161).

Almost surely, 2^111112321 is an apocalyptic number.

It is an amenable number.

111112321 is a deficient number, since it is larger than the sum of its proper divisors (1).

111112321 is an equidigital number, since it uses as much as digits as its factorization.

111112321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 111112321 is about 10540.9829238074. The cubic root of 111112321 is about 480.7516017245.

Adding to 111112321 its reverse (123211111), we get a palindrome (234323432).

It can be divided in two parts, 1111 and 12321, that multiplied together give a palindrome (13688631).

The spelling of 111112321 in words is "one hundred eleven million, one hundred twelve thousand, three hundred twenty-one".