55223321 has 2 divisors, whose sum is σ = 55223322. Its totient is φ = 55223320.

The previous prime is 55223251. The next prime is 55223323. The reversal of 55223321 is 12332255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 13801225 = 6436^2 + 3715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55223321 is a prime.

Together with 55223323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55223323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27611660 + 27611661.

It is an arithmetic number, because the mean of its divisors is an integer number (27611661).

Almost surely, 2^55223321 is an apocalyptic number.

It is an amenable number.

55223321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55223321 is an equidigital number, since it uses as much as digits as its factorization.

55223321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 23.

The square root of 55223321 is about 7431.2395332138. The cubic root of 55223321 is about 380.8092656316.

Adding to 55223321 its reverse (12332255), we get a palindrome (67555576).

The spelling of 55223321 in words is "fifty-five million, two hundred twenty-three thousand, three hundred twenty-one".