211021122102221 has 2 divisors, whose sum is σ = 211021122102222. Its totient is φ = 211021122102220.

The previous prime is 211021122102187. The next prime is 211021122102239. The reversal of 211021122102221 is 122201221120112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201100449018121 + 9920673084100 = 14180989^2 + 3149710^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021122102221 - 2¹⁰ = 211021122101197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211021122102193 and 211021122102202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211021122102121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510561051110 + 105510561051111.

It is an arithmetic number, because the mean of its divisors is an integer number (105510561051111).

Almost surely, 2^{211021122102221} is an apocalyptic number.

It is an amenable number.

211021122102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021122102221 is an equidigital number, since it uses as much as digits as its factorization.

211021122102221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 211021122102221 its reverse (122201221120112), we get a palindrome (333222343222333).

The spelling of 211021122102221 in words is "two hundred eleven trillion, twenty-one billion, one hundred twenty-two million, one hundred two thousand, two hundred twenty-one".