444342421 has 2 divisors, whose sum is σ = 444342422. Its totient is φ = 444342420.

The previous prime is 444342419. The next prime is 444342427. The reversal of 444342421 is 124243444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345439396 + 98903025 = 18586^2 + 9945^2 .

It is a cyclic number.

It is not a de Polignac number, because 444342421 - 2¹ = 444342419 is a prime.

Together with 444342419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 444342421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444342427) 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, 222171210 + 222171211.

It is an arithmetic number, because the mean of its divisors is an integer number (222171211).

Almost surely, 2^444342421 is an apocalyptic number.

It is an amenable number.

444342421 is a deficient number, since it is larger than the sum of its proper divisors (1).

444342421 is an equidigital number, since it uses as much as digits as its factorization.

444342421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 28.

The square root of 444342421 is about 21079.4312304673. The cubic root of 444342421 is about 763.0844300552.

Adding to 444342421 its reverse (124243444), we get a palindrome (568585865).

It can be divided in two parts, 4443 and 42421, that added together give a palindrome (46864).

The spelling of 444342421 in words is "four hundred forty-four million, three hundred forty-two thousand, four hundred twenty-one".