221111111101 has 2 divisors, whose sum is σ = 221111111102. Its totient is φ = 221111111100.

The previous prime is 221111111063. The next prime is 221111111113. The reversal of 221111111101 is 101111111122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192831643876 + 28279467225 = 439126^2 + 168165^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111111101 - 2¹¹ = 221111109053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221111111141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555555550 + 110555555551.

It is an arithmetic number, because the mean of its divisors is an integer number (110555555551).

Almost surely, 2^221111111101 is an apocalyptic number.

It is an amenable number.

221111111101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111111101 is an equidigital number, since it uses as much as digits as its factorization.

221111111101 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 13.

Adding to 221111111101 its reverse (101111111122), we get a palindrome (322222222223).

The spelling of 221111111101 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred one".