1321313402 has 8 divisors (see below), whose sum is σ = 2004239700. Its totient is φ = 653233504.

The previous prime is 1321313393. The next prime is 1321313419. The reversal of 1321313402 is 2043131231.

It can be written as a sum of positive squares in 2 ways, for example, as 1276704361 + 44609041 = 35731^2 + 6679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3711377 + ... + 3711732.

Almost surely, 2^1321313402 is an apocalyptic number.

1321313402 is a deficient number, since it is larger than the sum of its proper divisors (682926298).

1321313402 is an equidigital number, since it uses as much as digits as its factorization.

1321313402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7423200.

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

The square root of 1321313402 is about 36349.8748553554. The cubic root of 1321313402 is about 1097.3250159394.

Adding to 1321313402 its reverse (2043131231), we get a palindrome (3364444633).

The spelling of 1321313402 in words is "one billion, three hundred twenty-one million, three hundred thirteen thousand, four hundred two".