1321105447 has 2 divisors, whose sum is σ = 1321105448. Its totient is φ = 1321105446.

The previous prime is 1321105399. The next prime is 1321105459. The reversal of 1321105447 is 7445011231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321105447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321205447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660552723 + 660552724.

It is an arithmetic number, because the mean of its divisors is an integer number (660552724).

Almost surely, 2^1321105447 is an apocalyptic number.

1321105447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321105447 is an equidigital number, since it uses as much as digits as its factorization.

1321105447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1321105447 is about 36347.0142790299. The cubic root of 1321105447 is about 1097.2674453948.

Adding to 1321105447 its reverse (7445011231), we get a palindrome (8766116678).

The spelling of 1321105447 in words is "one billion, three hundred twenty-one million, one hundred five thousand, four hundred forty-seven".