111221101 has 2 divisors, whose sum is σ = 111221102. Its totient is φ = 111221100.

The previous prime is 111221057. The next prime is 111221141. The reversal of 111221101 is 101122111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86955625 + 24265476 = 9325^2 + 4926^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221101 - 2¹⁵ = 111188333 is a prime.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610550 + 55610551.

It is an arithmetic number, because the mean of its divisors is an integer number (55610551).

Almost surely, 2^111221101 is an apocalyptic number.

It is an amenable number.

111221101 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221101 is an equidigital number, since it uses as much as digits as its factorization.

111221101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 111221101 is about 10546.1415219027. The cubic root of 111221101 is about 480.9084373239.

Adding to 111221101 its reverse (101122111), we get a palindrome (212343212).

It can be divided in two parts, 11122110 and 1, that added together give a palindrome (11122111).

The spelling of 111221101 in words is "one hundred eleven million, two hundred twenty-one thousand, one hundred one".