21022122201121 has 2 divisors, whose sum is σ = 21022122201122. Its totient is φ = 21022122201120.

The previous prime is 21022122201107. The next prime is 21022122201151. The reversal of 21022122201121 is 12110222122012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12732329561121 + 8289792640000 = 3568239^2 + 2879200^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022122201121 - 2⁵ = 21022122201089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022122201151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511061100560 + 10511061100561.

It is an arithmetic number, because the mean of its divisors is an integer number (10511061100561).

Almost surely, 2^{21022122201121} is an apocalyptic number.

It is an amenable number.

21022122201121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022122201121 is an equidigital number, since it uses as much as digits as its factorization.

21022122201121 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 19.

Adding to 21022122201121 its reverse (12110222122012), we get a palindrome (33132344323133).

The spelling of 21022122201121 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-two million, two hundred one thousand, one hundred twenty-one".