22122200021 has 2 divisors, whose sum is σ = 22122200022. Its totient is φ = 22122200020.

The previous prime is 22122200017. The next prime is 22122200039. The reversal of 22122200021 is 12000222122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16968970225 + 5153229796 = 130265^2 + 71786^2 .

It is a cyclic number.

It is not a de Polignac number, because 22122200021 - 2² = 22122200017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22122199969 and 22122200005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22122200041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11061100010 + 11061100011.

It is an arithmetic number, because the mean of its divisors is an integer number (11061100011).

Almost surely, 2^22122200021 is an apocalyptic number.

It is an amenable number.

22122200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22122200021 is an equidigital number, since it uses as much as digits as its factorization.

22122200021 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 14.

Adding to 22122200021 its reverse (12000222122), we get a palindrome (34122422143).

The spelling of 22122200021 in words is "twenty-two billion, one hundred twenty-two million, two hundred thousand, twenty-one".