21122022022121 has 2 divisors, whose sum is σ = 21122022022122. Its totient is φ = 21122022022120.

The previous prime is 21122022022063. The next prime is 21122022022139. The reversal of 21122022022121 is 12122022022112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11530235184400 + 9591786837721 = 3395620^2 + 3097061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122022022121 is a prime.

It is a super-2 number, since 2×21122022022121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122022022093 and 21122022022102.

It is not a weakly prime, because it can be changed into another prime (21122022022141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561011011060 + 10561011011061.

It is an arithmetic number, because the mean of its divisors is an integer number (10561011011061).

Almost surely, 2^{21122022022121} is an apocalyptic number.

It is an amenable number.

21122022022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122022022121 is an equidigital number, since it uses as much as digits as its factorization.

21122022022121 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 20.

Adding to 21122022022121 its reverse (12122022022112), we get a palindrome (33244044044233).

Subtracting from 21122022022121 its reverse (12122022022112), we obtain a palindrome (9000000000009).

The spelling of 21122022022121 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-two million, twenty-two thousand, one hundred twenty-one".