201111102221 has 2 divisors, whose sum is σ = 201111102222. Its totient is φ = 201111102220.

The previous prime is 201111102217. The next prime is 201111102251. The reversal of 201111102221 is 122201111102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160008000100 + 41103102121 = 400010^2 + 202739^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111102221 - 2² = 201111102217 is a prime.

It is a super-2 number, since 2×201111102221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201111102196 and 201111102205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201111102251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555551110 + 100555551111.

It is an arithmetic number, because the mean of its divisors is an integer number (100555551111).

Almost surely, 2^201111102221 is an apocalyptic number.

It is an amenable number.

201111102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111102221 is an equidigital number, since it uses as much as digits as its factorization.

201111102221 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 14.

Adding to 201111102221 its reverse (122201111102), we get a palindrome (323312213323).

The spelling of 201111102221 in words is "two hundred one billion, one hundred eleven million, one hundred two thousand, two hundred twenty-one".