1221304067 has 2 divisors, whose sum is σ = 1221304068. Its totient is φ = 1221304066.

The previous prime is 1221304037. The next prime is 1221304087. The reversal of 1221304067 is 7604031221.

It is a strong prime.

It is an emirp because it is prime and its reverse (7604031221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221304067 - 2²² = 1217109763 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221304037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610652033 + 610652034.

It is an arithmetic number, because the mean of its divisors is an integer number (610652034).

Almost surely, 2^1221304067 is an apocalyptic number.

1221304067 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221304067 is an equidigital number, since it uses as much as digits as its factorization.

1221304067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1221304067 is about 34947.1610721100. The cubic root of 1221304067 is about 1068.9103143484.

Adding to 1221304067 its reverse (7604031221), we get a palindrome (8825335288).

The spelling of 1221304067 in words is "one billion, two hundred twenty-one million, three hundred four thousand, sixty-seven".