320021121031 has 4 divisors (see below), whose sum is σ = 323876797272. Its totient is φ = 316165444792.

The previous prime is 320021121011. The next prime is 320021121041. The reversal of 320021121031 is 130121120023.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 320021121031 - 2⁵ = 320021120999 is a prime.

It is a super-2 number, since 2×320021121031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320021120996 and 320021121014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320021121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1927837996 + ... + 1927838161.

It is an arithmetic number, because the mean of its divisors is an integer number (80969199318).

Almost surely, 2^320021121031 is an apocalyptic number.

320021121031 is a deficient number, since it is larger than the sum of its proper divisors (3855676241).

320021121031 is an equidigital number, since it uses as much as digits as its factorization.

320021121031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855676240.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 320021121031 its reverse (130121120023), we get a palindrome (450142241054).

The spelling of 320021121031 in words is "three hundred twenty billion, twenty-one million, one hundred twenty-one thousand, thirty-one".