321131543021 has 12 divisors (see below), whose sum is σ = 339228798300. Its totient is φ = 303955175808.

The previous prime is 321131543011. The next prime is 321131543063. The reversal of 321131543021 is 120345131123.

It can be written as a sum of positive squares in 2 ways, for example, as 109610655625 + 211520887396 = 331075^2 + 459914^2 .

It is not a de Polignac number, because 321131543021 - 2¹⁴ = 321131526637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321131543011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 716 + ... + 801413.

It is an arithmetic number, because the mean of its divisors is an integer number (28269066525).

Almost surely, 2^321131543021 is an apocalyptic number.

It is an amenable number.

321131543021 is a deficient number, since it is larger than the sum of its proper divisors (18097255279).

321131543021 is a wasteful number, since it uses less digits than its factorization.

321131543021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803276 (or 803257 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 321131543021 its reverse (120345131123), we get a palindrome (441476674144).

The spelling of 321131543021 in words is "three hundred twenty-one billion, one hundred thirty-one million, five hundred forty-three thousand, twenty-one".