211121012222221 has 2 divisors, whose sum is σ = 211121012222222. Its totient is φ = 211121012222220.

The previous prime is 211121012222203. The next prime is 211121012222231. The reversal of 211121012222221 is 122222210121112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115670261610121 + 95450750612100 = 10755011^2 + 9769890^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121012222221 - 2⁹ = 211121012221709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121012222192 and 211121012222201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121012222231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560506111110 + 105560506111111.

It is an arithmetic number, because the mean of its divisors is an integer number (105560506111111).

Almost surely, 2^{211121012222221} is an apocalyptic number.

It is an amenable number.

211121012222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121012222221 is an equidigital number, since it uses as much as digits as its factorization.

211121012222221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 211121012222221 its reverse (122222210121112), we get a palindrome (333343222343333).

The spelling of 211121012222221 in words is "two hundred eleven trillion, one hundred twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".