201122112222221 has 2 divisors, whose sum is σ = 201122112222222. Its totient is φ = 201122112222220.

The previous prime is 201122112222197. The next prime is 201122112222287. The reversal of 201122112222221 is 122222211221102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141634134228196 + 59487977994025 = 11901014^2 + 7712845^2 .

It is a cyclic number.

It is not a de Polignac number, because 201122112222221 - 2²² = 201122108027917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201122112222821) 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, 100561056111110 + 100561056111111.

It is an arithmetic number, because the mean of its divisors is an integer number (100561056111111).

Almost surely, 2^{201122112222221} is an apocalyptic number.

It is an amenable number.

201122112222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201122112222221 is an equidigital number, since it uses as much as digits as its factorization.

201122112222221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 201122112222221 its reverse (122222211221102), we get a palindrome (323344323443323).

The spelling of 201122112222221 in words is "two hundred one trillion, one hundred twenty-two billion, one hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".