320331213421 has 4 divisors (see below), whose sum is σ = 320332463100. Its totient is φ = 320329963744.

The previous prime is 320331213409. The next prime is 320331213437. The reversal of 320331213421 is 124312133023.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 91645452900 + 228685760521 = 302730^2 + 478211^2 .

It is a cyclic number.

It is not a de Polignac number, because 320331213421 - 2²⁷ = 320196995693 is a prime.

It is a super-2 number, since 2×320331213421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320331213491) 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, 84706 + ... + 804883.

It is an arithmetic number, because the mean of its divisors is an integer number (80083115775).

Almost surely, 2^320331213421 is an apocalyptic number.

It is an amenable number.

320331213421 is a deficient number, since it is larger than the sum of its proper divisors (1249679).

320331213421 is an equidigital number, since it uses as much as digits as its factorization.

320331213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249678.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 320331213421 its reverse (124312133023), we get a palindrome (444643346444).

The spelling of 320331213421 in words is "three hundred twenty billion, three hundred thirty-one million, two hundred thirteen thousand, four hundred twenty-one".