111211021110221 has 2 divisors, whose sum is σ = 111211021110222. Its totient is φ = 111211021110220.

The previous prime is 111211021110191. The next prime is 111211021110227. The reversal of 111211021110221 is 122011120112111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110545142262025 + 665878848196 = 10514045^2 + 816014^2 .

It is an emirp because it is prime and its reverse (122011120112111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111211021110221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111211021110221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111211021110227) 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, 55605510555110 + 55605510555111.

It is an arithmetic number, because the mean of its divisors is an integer number (55605510555111).

Almost surely, 2^{111211021110221} is an apocalyptic number.

It is an amenable number.

111211021110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211021110221 is an equidigital number, since it uses as much as digits as its factorization.

111211021110221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111211021110221 its reverse (122011120112111), we get a palindrome (233222141222332).

The spelling of 111211021110221 in words is "one hundred eleven trillion, two hundred eleven billion, twenty-one million, one hundred ten thousand, two hundred twenty-one".