1303111321 has 4 divisors (see below), whose sum is σ = 1307815972. Its totient is φ = 1298406672.

The previous prime is 1303111309. The next prime is 1303111349. The reversal of 1303111321 is 1231113031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1231113031 = 18131 ⋅67901.

It can be written as a sum of positive squares in 2 ways, for example, as 541958400 + 761152921 = 23280^2 + 27589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1303111321 - 2⁷ = 1303111193 is a prime.

It is a super-2 number, since 2×1303111321² = 3396198229836730082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1303111295 and 1303111304.

It is not an unprimeable number, because it can be changed into a prime (1303111021) 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, 2351910 + ... + 2352463.

It is an arithmetic number, because the mean of its divisors is an integer number (326953993).

Almost surely, 2^1303111321 is an apocalyptic number.

It is an amenable number.

1303111321 is a deficient number, since it is larger than the sum of its proper divisors (4704651).

1303111321 is an equidigital number, since it uses as much as digits as its factorization.

1303111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704650.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1303111321 is about 36098.6332289742. The cubic root of 1303111321 is about 1092.2628749099.

Adding to 1303111321 its reverse (1231113031), we get a palindrome (2534224352).

The spelling of 1303111321 in words is "one billion, three hundred three million, one hundred eleven thousand, three hundred twenty-one".