321131144521 has 24 divisors (see below), whose sum is σ = 360793036800. Its totient is φ = 285485038080.

The previous prime is 321131144497. The next prime is 321131144527. The reversal of 321131144521 is 125441131123.

It is not a de Polignac number, because 321131144521 - 2¹¹ = 321131142473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321131144521.

It is not an unprimeable number, because it can be changed into a prime (321131144527) 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 23 ways as a sum of consecutive naturals, for example, 6897880 + ... + 6944278.

It is an arithmetic number, because the mean of its divisors is an integer number (15033043200).

Almost surely, 2^321131144521 is an apocalyptic number.

It is an amenable number.

321131144521 is a deficient number, since it is larger than the sum of its proper divisors (39661892279).

321131144521 is a wasteful number, since it uses less digits than its factorization.

321131144521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47685 (or 47674 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

Adding to 321131144521 its reverse (125441131123), we get a palindrome (446572275644).

The spelling of 321131144521 in words is "three hundred twenty-one billion, one hundred thirty-one million, one hundred forty-four thousand, five hundred twenty-one".