320131021 has 4 divisors (see below), whose sum is σ = 365864032. Its totient is φ = 274398012.

The previous prime is 320131003. The next prime is 320131027. The reversal of 320131021 is 120131023.

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 not a de Polignac number, because 320131021 - 2²¹ = 318033869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320130992 and 320131010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320131027) 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, 22866495 + ... + 22866508.

It is an arithmetic number, because the mean of its divisors is an integer number (91466008).

Almost surely, 2^320131021 is an apocalyptic number.

It is an amenable number.

320131021 is a deficient number, since it is larger than the sum of its proper divisors (45733011).

320131021 is an equidigital number, since it uses as much as digits as its factorization.

320131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45733010.

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

The square root of 320131021 is about 17892.2055934980. The cubic root of 320131021 is about 684.0837170824.

Adding to 320131021 its reverse (120131023), we get a palindrome (440262044).

The spelling of 320131021 in words is "three hundred twenty million, one hundred thirty-one thousand, twenty-one".