22200222221 has 2 divisors, whose sum is σ = 22200222222. Its totient is φ = 22200222220.

The previous prime is 22200222217. The next prime is 22200222223. The reversal of 22200222221 is 12222200222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20452146121 + 1748076100 = 143011^2 + 41810^2 .

It is a cyclic number.

It is not a de Polignac number, because 22200222221 - 2² = 22200222217 is a prime.

Together with 22200222223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22200222221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22200222223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11100111110 + 11100111111.

It is an arithmetic number, because the mean of its divisors is an integer number (11100111111).

Almost surely, 2^22200222221 is an apocalyptic number.

It is an amenable number.

22200222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22200222221 is an equidigital number, since it uses as much as digits as its factorization.

22200222221 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 17.

Adding to 22200222221 its reverse (12222200222), we get a palindrome (34422422443).

The spelling of 22200222221 in words is "twenty-two billion, two hundred million, two hundred twenty-two thousand, two hundred twenty-one".