1321105399 has 2 divisors, whose sum is σ = 1321105400. Its totient is φ = 1321105398.

The previous prime is 1321105369. The next prime is 1321105447. The reversal of 1321105399 is 9935011231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321105399 - 2²³ = 1312716791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321105369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660552699 + 660552700.

It is an arithmetic number, because the mean of its divisors is an integer number (660552700).

Almost surely, 2^1321105399 is an apocalyptic number.

1321105399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321105399 is an equidigital number, since it uses as much as digits as its factorization.

1321105399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 1321105399 is about 36347.0136187280. The cubic root of 1321105399 is about 1097.2674321057.

The spelling of 1321105399 in words is "one billion, three hundred twenty-one million, one hundred five thousand, three hundred ninety-nine".