1321322357 has 2 divisors, whose sum is σ = 1321322358. Its totient is φ = 1321322356.

The previous prime is 1321322323. The next prime is 1321322363. The reversal of 1321322357 is 7532231231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002735556 + 318586801 = 31666^2 + 17849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321322357 - 2¹⁰ = 1321321333 is a prime.

It is a super-3 number, since 3×1321322357³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321322857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660661178 + 660661179.

It is an arithmetic number, because the mean of its divisors is an integer number (660661179).

Almost surely, 2^1321322357 is an apocalyptic number.

It is an amenable number.

1321322357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321322357 is an equidigital number, since it uses as much as digits as its factorization.

1321322357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 29.

The square root of 1321322357 is about 36349.9980330123. The cubic root of 1321322357 is about 1097.3274949181.

Adding to 1321322357 its reverse (7532231231), we get a palindrome (8853553588).

The spelling of 1321322357 in words is "one billion, three hundred twenty-one million, three hundred twenty-two thousand, three hundred fifty-seven".