201222111121 has 2 divisors, whose sum is σ = 201222111122. Its totient is φ = 201222111120.

The previous prime is 201222111119. The next prime is 201222111131. The reversal of 201222111121 is 121111222102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200850970896 + 371140225 = 448164^2 + 19265^2 .

It is a cyclic number.

It is not a de Polignac number, because 201222111121 - 2¹ = 201222111119 is a prime.

Together with 201222111119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 201222111095 and 201222111104.

It is not a weakly prime, because it can be changed into another prime (201222111131) 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, 100611055560 + 100611055561.

It is an arithmetic number, because the mean of its divisors is an integer number (100611055561).

Almost surely, 2^201222111121 is an apocalyptic number.

It is an amenable number.

201222111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201222111121 is an equidigital number, since it uses as much as digits as its factorization.

201222111121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201222111121 its reverse (121111222102), we get a palindrome (322333333223).

The spelling of 201222111121 in words is "two hundred one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred twenty-one".