211222020111121 has 2 divisors, whose sum is σ = 211222020111122. Its totient is φ = 211222020111120.

The previous prime is 211222020111077. The next prime is 211222020111127. The reversal of 211222020111121 is 121111020222112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183413905355521 + 27808114755600 = 13543039^2 + 5273340^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222020111121 - 2⁹ = 211222020110609 is a prime.

It is a super-2 number, since 2×211222020111121² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211222020111127) 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, 105611010055560 + 105611010055561.

It is an arithmetic number, because the mean of its divisors is an integer number (105611010055561).

Almost surely, 2^{211222020111121} is an apocalyptic number.

It is an amenable number.

211222020111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222020111121 is an equidigital number, since it uses as much as digits as its factorization.

211222020111121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211222020111121 its reverse (121111020222112), we get a palindrome (332333040333233).

The spelling of 211222020111121 in words is "two hundred eleven trillion, two hundred twenty-two billion, twenty million, one hundred eleven thousand, one hundred twenty-one".