1313043021 has 32 divisors (see below), whose sum is σ = 2040318720. Its totient is φ = 832974912.

The previous prime is 1313043001. The next prime is 1313043047. The reversal of 1313043021 is 1203403131.

It is not a de Polignac number, because 1313043021 - 2⁷ = 1313042893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1313042985 and 1313043003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313043001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116971 + ... + 127703.

It is an arithmetic number, because the mean of its divisors is an integer number (63759960).

Almost surely, 2^1313043021 is an apocalyptic number.

It is an amenable number.

1313043021 is a deficient number, since it is larger than the sum of its proper divisors (727275699).

1313043021 is a wasteful number, since it uses less digits than its factorization.

1313043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10962 (or 10956 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1313043021 is about 36235.9354922707. The cubic root of 1313043021 is about 1095.0307591284.

Adding to 1313043021 its reverse (1203403131), we get a palindrome (2516446152).

The spelling of 1313043021 in words is "one billion, three hundred thirteen million, forty-three thousand, twenty-one".