201211122202121 has 2 divisors, whose sum is σ = 201211122202122. Its totient is φ = 201211122202120.

The previous prime is 201211122202087. The next prime is 201211122202133. The reversal of 201211122202121 is 121202221112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189993445683721 + 11217676518400 = 13783811^2 + 3349280^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211122202121 - 2³⁸ = 200936244295177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201211122202093 and 201211122202102.

It is not a weakly prime, because it can be changed into another prime (201211122202021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605561101060 + 100605561101061.

It is an arithmetic number, because the mean of its divisors is an integer number (100605561101061).

Almost surely, 2^{201211122202121} is an apocalyptic number.

It is an amenable number.

201211122202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211122202121 is an equidigital number, since it uses as much as digits as its factorization.

201211122202121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 201211122202121 its reverse (121202221112102), we get a palindrome (322413343314223).

The spelling of 201211122202121 in words is "two hundred one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred two thousand, one hundred twenty-one".