111221441 has 2 divisors, whose sum is σ = 111221442. Its totient is φ = 111221440.

The previous prime is 111221437. The next prime is 111221477. The reversal of 111221441 is 144122111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103958416 + 7263025 = 10196^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221441 - 2² = 111221437 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111221141) 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, 55610720 + 55610721.

It is an arithmetic number, because the mean of its divisors is an integer number (55610721).

Almost surely, 2^111221441 is an apocalyptic number.

It is an amenable number.

111221441 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221441 is an equidigital number, since it uses as much as digits as its factorization.

111221441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 17.

The square root of 111221441 is about 10546.1576415299. The cubic root of 111221441 is about 480.9089273649.

Adding to 111221441 its reverse (144122111), we get a palindrome (255343552).

The spelling of 111221441 in words is "one hundred eleven million, two hundred twenty-one thousand, four hundred forty-one".