1304133221 has 2 divisors, whose sum is σ = 1304133222. Its totient is φ = 1304133220.

The previous prime is 1304133209. The next prime is 1304133241. The reversal of 1304133221 is 1223314031.

It is an a-pointer prime, because the next prime (1304133241) can be obtained adding 1304133221 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 780364225 + 523768996 = 27935^2 + 22886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304133221 - 2⁶ = 1304133157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1304133193 and 1304133202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304133241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652066610 + 652066611.

It is an arithmetic number, because the mean of its divisors is an integer number (652066611).

Almost surely, 2^1304133221 is an apocalyptic number.

It is an amenable number.

1304133221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304133221 is an equidigital number, since it uses as much as digits as its factorization.

1304133221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1304133221 is about 36112.7847306186. The cubic root of 1304133221 is about 1092.5483178521.

Adding to 1304133221 its reverse (1223314031), we get a palindrome (2527447252).

The spelling of 1304133221 in words is "one billion, three hundred four million, one hundred thirty-three thousand, two hundred twenty-one".