1304221 has 2 divisors, whose sum is σ = 1304222. Its totient is φ = 1304220.

The previous prime is 1304209. The next prime is 1304227. The reversal of 1304221 is 1224031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881721 + 422500 = 939^2 + 650^2 .

It is an emirp because it is prime and its reverse (1224031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1304221 - 2¹¹ = 1302173 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304227) 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, 652110 + 652111.

It is an arithmetic number, because the mean of its divisors is an integer number (652111).

2^1304221 is an apocalyptic number.

It is an amenable number.

1304221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304221 is an equidigital number, since it uses as much as digits as its factorization.

1304221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1304221 is about 1142.0249559445. The cubic root of 1304221 is about 109.2572829828.

Adding to 1304221 its reverse (1224031), we get a palindrome (2528252).

The spelling of 1304221 in words is "one million, three hundred four thousand, two hundred twenty-one".