1221304367 has 2 divisors, whose sum is σ = 1221304368. Its totient is φ = 1221304366.

The previous prime is 1221304333. The next prime is 1221304397. The reversal of 1221304367 is 7634031221.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7634031221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221304367 - 2⁸ = 1221304111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221304397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610652183 + 610652184.

It is an arithmetic number, because the mean of its divisors is an integer number (610652184).

Almost surely, 2^1221304367 is an apocalyptic number.

1221304367 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221304367 is an equidigital number, since it uses as much as digits as its factorization.

1221304367 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 1221304367 is about 34947.1653643039. The cubic root of 1221304367 is about 1068.9104018704.

Adding to 1221304367 its reverse (7634031221), we get a palindrome (8855335588).

The spelling of 1221304367 in words is "one billion, two hundred twenty-one million, three hundred four thousand, three hundred sixty-seven".