1320310021 has 4 divisors (see below), whose sum is σ = 1320789952. Its totient is φ = 1319830092.

The previous prime is 1320310007. The next prime is 1320310027. The reversal of 1320310021 is 1200130231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1320310021 - 2²⁷ = 1186092293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320309983 and 1320310010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320310027) 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, 235815 + ... + 241348.

It is an arithmetic number, because the mean of its divisors is an integer number (330197488).

Almost surely, 2^1320310021 is an apocalyptic number.

It is an amenable number.

1320310021 is a deficient number, since it is larger than the sum of its proper divisors (479931).

1320310021 is an equidigital number, since it uses as much as digits as its factorization.

1320310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479930.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1320310021 is about 36336.0705222785. The cubic root of 1320310021 is about 1097.0471828152.

Adding to 1320310021 its reverse (1200130231), we get a palindrome (2520440252).

The spelling of 1320310021 in words is "one billion, three hundred twenty million, three hundred ten thousand, twenty-one".