21222110211121 has 2 divisors, whose sum is σ = 21222110211122. Its totient is φ = 21222110211120.

The previous prime is 21222110211119. The next prime is 21222110211167. The reversal of 21222110211121 is 12111201122212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14855011808400 + 6367098402721 = 3854220^2 + 2523311^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222110211121 - 2¹ = 21222110211119 is a prime.

Together with 21222110211119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21222110211221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611055105560 + 10611055105561.

It is an arithmetic number, because the mean of its divisors is an integer number (10611055105561).

Almost surely, 2^{21222110211121} is an apocalyptic number.

It is an amenable number.

21222110211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222110211121 is an equidigital number, since it uses as much as digits as its factorization.

21222110211121 is an evil number, because the sum of its binary digits is even.

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

Adding to 21222110211121 its reverse (12111201122212), we get a palindrome (33333311333333).

The spelling of 21222110211121 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, two hundred eleven thousand, one hundred twenty-one".