21111222110201 has 2 divisors, whose sum is σ = 21111222110202. Its totient is φ = 21111222110200.

The previous prime is 21111222110197. The next prime is 21111222110203. The reversal of 21111222110201 is 10201122211112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16545410436025 + 4565811674176 = 4067605^2 + 2136776^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111222110201 - 2² = 21111222110197 is a prime.

Together with 21111222110203, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111222110201.

It is not a weakly prime, because it can be changed into another prime (21111222110203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555611055100 + 10555611055101.

It is an arithmetic number, because the mean of its divisors is an integer number (10555611055101).

Almost surely, 2^{21111222110201} is an apocalyptic number.

It is an amenable number.

21111222110201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111222110201 is an equidigital number, since it uses as much as digits as its factorization.

21111222110201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111222110201 its reverse (10201122211112), we get a palindrome (31312344321313).

The spelling of 21111222110201 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-two million, one hundred ten thousand, two hundred one".