1304231221 has 2 divisors, whose sum is σ = 1304231222. Its totient is φ = 1304231220.

The previous prime is 1304231191. The next prime is 1304231267. The reversal of 1304231221 is 1221324031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923552100 + 380679121 = 30390^2 + 19511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304231221 - 2⁵ = 1304231189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304231821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652115610 + 652115611.

It is an arithmetic number, because the mean of its divisors is an integer number (652115611).

Almost surely, 2^1304231221 is an apocalyptic number.

It is an amenable number.

1304231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304231221 is an equidigital number, since it uses as much as digits as its factorization.

1304231221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1304231221 is about 36114.1415653204. The cubic root of 1304231221 is about 1092.5756839350.

Adding to 1304231221 its reverse (1221324031), we get a palindrome (2525555252).

The spelling of 1304231221 in words is "one billion, three hundred four million, two hundred thirty-one thousand, two hundred twenty-one".