222444421 has 2 divisors, whose sum is σ = 222444422. Its totient is φ = 222444420.

The previous prime is 222444379. The next prime is 222444427. The reversal of 222444421 is 124444222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171321921 + 51122500 = 13089^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 222444421 - 2⁹ = 222443909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222444427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111222210 + 111222211.

It is an arithmetic number, because the mean of its divisors is an integer number (111222211).

Almost surely, 2^222444421 is an apocalyptic number.

It is an amenable number.

222444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

222444421 is an equidigital number, since it uses as much as digits as its factorization.

222444421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4096, while the sum is 25.

The square root of 222444421 is about 14914.5707615070. The cubic root of 222444421 is about 605.9086780156.

Adding to 222444421 its reverse (124444222), we get a palindrome (346888643).

The spelling of 222444421 in words is "two hundred twenty-two million, four hundred forty-four thousand, four hundred twenty-one".