111201221 has 2 divisors, whose sum is σ = 111201222. Its totient is φ = 111201220.

The previous prime is 111201217. The next prime is 111201229. The reversal of 111201221 is 122102111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89680900 + 21520321 = 9470^2 + 4639^2 .

It is an emirp because it is prime and its reverse (122102111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111201221 - 2² = 111201217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111201229) 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, 55600610 + 55600611.

It is an arithmetic number, because the mean of its divisors is an integer number (55600611).

Almost surely, 2^111201221 is an apocalyptic number.

It is an amenable number.

111201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111201221 is an equidigital number, since it uses as much as digits as its factorization.

111201221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 111201221 is about 10545.1989549747. The cubic root of 111201221 is about 480.8797826012.

Adding to 111201221 its reverse (122102111), we get a palindrome (233303332).

The spelling of 111201221 in words is "one hundred eleven million, two hundred one thousand, two hundred twenty-one".