1321120343 has 2 divisors, whose sum is σ = 1321120344. Its totient is φ = 1321120342.

The previous prime is 1321120243. The next prime is 1321120349. The reversal of 1321120343 is 3430211231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321120343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321120349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660560171 + 660560172.

It is an arithmetic number, because the mean of its divisors is an integer number (660560172).

Almost surely, 2^1321120343 is an apocalyptic number.

1321120343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321120343 is an equidigital number, since it uses as much as digits as its factorization.

1321120343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1321120343 is about 36347.2191921198. The cubic root of 1321120343 is about 1097.2715694245.

Adding to 1321120343 its reverse (3430211231), we get a palindrome (4751331574).

The spelling of 1321120343 in words is "one billion, three hundred twenty-one million, one hundred twenty thousand, three hundred forty-three".