1321351043 has 4 divisors (see below), whose sum is σ = 1327276608. Its totient is φ = 1315425480.

The previous prime is 1321351039. The next prime is 1321351069. The reversal of 1321351043 is 3401531231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3401531231 = 7 ⋅485933033.

It is a cyclic number.

It is not a de Polignac number, because 1321351043 - 2² = 1321351039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321351033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2962448 + ... + 2962893.

It is an arithmetic number, because the mean of its divisors is an integer number (331819152).

Almost surely, 2^1321351043 is an apocalyptic number.

1321351043 is a deficient number, since it is larger than the sum of its proper divisors (5925565).

1321351043 is an equidigital number, since it uses as much as digits as its factorization.

1321351043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5925564.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1321351043 is about 36350.3926113598. The cubic root of 1321351043 is about 1097.3354358793.

Adding to 1321351043 its reverse (3401531231), we get a palindrome (4722882274).

The spelling of 1321351043 in words is "one billion, three hundred twenty-one million, three hundred fifty-one thousand, forty-three".