1320021343 has 2 divisors, whose sum is σ = 1320021344. Its totient is φ = 1320021342.

The previous prime is 1320021341. The next prime is 1320021397. The reversal of 1320021343 is 3431200231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320021343 - 2¹ = 1320021341 is a prime.

Together with 1320021341, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1320021343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320021341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660010671 + 660010672.

It is an arithmetic number, because the mean of its divisors is an integer number (660010672).

Almost surely, 2^1320021343 is an apocalyptic number.

1320021343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320021343 is an equidigital number, since it uses as much as digits as its factorization.

1320021343 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 19.

The square root of 1320021343 is about 36332.0979713531. The cubic root of 1320021343 is about 1096.9672226883.

Adding to 1320021343 its reverse (3431200231), we get a palindrome (4751221574).

It can be divided in two parts, 13200 and 21343, that added together give a palindrome (34543).

The spelling of 1320021343 in words is "one billion, three hundred twenty million, twenty-one thousand, three hundred forty-three".