1321040343 has 12 divisors (see below), whose sum is σ = 2048960760. Its totient is φ = 754880112.

The previous prime is 1321040269. The next prime is 1321040353. The reversal of 1321040343 is 3430401231.

It is not a de Polignac number, because 1321040343 - 2⁹ = 1321039831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321040353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4493188 + ... + 4493481.

It is an arithmetic number, because the mean of its divisors is an integer number (170746730).

Almost surely, 2^1321040343 is an apocalyptic number.

1321040343 is a deficient number, since it is larger than the sum of its proper divisors (727920417).

1321040343 is an equidigital number, since it uses as much as digits as its factorization.

1321040343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8986686 (or 8986679 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1321040343 is about 36346.1186786155. The cubic root of 1321040343 is about 1097.2494206733.

Adding to 1321040343 its reverse (3430401231), we get a palindrome (4751441574).

The spelling of 1321040343 in words is "one billion, three hundred twenty-one million, forty thousand, three hundred forty-three".