74444221 has 2 divisors, whose sum is σ = 74444222. Its totient is φ = 74444220.

The previous prime is 74444203. The next prime is 74444231. The reversal of 74444221 is 12244447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68244121 + 6200100 = 8261^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 74444221 - 2¹⁹ = 73919933 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 74444221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74444231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37222110 + 37222111.

It is an arithmetic number, because the mean of its divisors is an integer number (37222111).

Almost surely, 2^74444221 is an apocalyptic number.

It is an amenable number.

74444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

74444221 is an equidigital number, since it uses as much as digits as its factorization.

74444221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 28.

The square root of 74444221 is about 8628.1064550688. The cubic root of 74444221 is about 420.6720551911.

Adding to 74444221 its reverse (12244447), we get a palindrome (86688668).

The spelling of 74444221 in words is "seventy-four million, four hundred forty-four thousand, two hundred twenty-one".