22213222121 has 2 divisors, whose sum is σ = 22213222122. Its totient is φ = 22213222120.

The previous prime is 22213222117. The next prime is 22213222139. The reversal of 22213222121 is 12122231222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21319212121 + 894010000 = 146011^2 + 29900^2 .

It is a cyclic number.

It is not a de Polignac number, because 22213222121 - 2² = 22213222117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22213222093 and 22213222102.

It is not a weakly prime, because it can be changed into another prime (22213222151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11106611060 + 11106611061.

It is an arithmetic number, because the mean of its divisors is an integer number (11106611061).

Almost surely, 2^22213222121 is an apocalyptic number.

It is an amenable number.

22213222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22213222121 is an equidigital number, since it uses as much as digits as its factorization.

22213222121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 20.

Adding to 22213222121 its reverse (12122231222), we get a palindrome (34335453343).

The spelling of 22213222121 in words is "twenty-two billion, two hundred thirteen million, two hundred twenty-two thousand, one hundred twenty-one".