111131121303221 has 2 divisors, whose sum is σ = 111131121303222. Its totient is φ = 111131121303220.

The previous prime is 111131121303203. The next prime is 111131121303247. The reversal of 111131121303221 is 122303121131111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110994358168996 + 136763134225 = 10535386^2 + 369815^2 .

It is a cyclic number.

It is not a de Polignac number, because 111131121303221 - 2¹⁰ = 111131121302197 is a prime.

It is a super-2 number, since 2×111131121303221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111131121303121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55565560651610 + 55565560651611.

It is an arithmetic number, because the mean of its divisors is an integer number (55565560651611).

Almost surely, 2^{111131121303221} is an apocalyptic number.

It is an amenable number.

111131121303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111131121303221 is an equidigital number, since it uses as much as digits as its factorization.

111131121303221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

Adding to 111131121303221 its reverse (122303121131111), we get a palindrome (233434242434332).

The spelling of 111131121303221 in words is "one hundred eleven trillion, one hundred thirty-one billion, one hundred twenty-one million, three hundred three thousand, two hundred twenty-one".