111220321 has 2 divisors, whose sum is σ = 111220322. Its totient is φ = 111220320.

The previous prime is 111220313. The next prime is 111220339. The reversal of 111220321 is 123022111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98724096 + 12496225 = 9936^2 + 3535^2 .

It is an emirp because it is prime and its reverse (123022111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111220321 - 2³ = 111220313 is a prime.

It is not a weakly prime, because it can be changed into another prime (111220301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610160 + 55610161.

It is an arithmetic number, because the mean of its divisors is an integer number (55610161).

Almost surely, 2^111220321 is an apocalyptic number.

It is an amenable number.

111220321 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220321 is an equidigital number, since it uses as much as digits as its factorization.

111220321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 111220321 is about 10546.1045414883. The cubic root of 111220321 is about 480.9073131084.

Adding to 111220321 its reverse (123022111), we get a palindrome (234242432).

The spelling of 111220321 in words is "one hundred eleven million, two hundred twenty thousand, three hundred twenty-one".