321131320121 has 16 divisors (see below), whose sum is σ = 328341361920. Its totient is φ = 314016955200.

The previous prime is 321131320049. The next prime is 321131320127. The reversal of 321131320121 is 121023131123.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 321131320121 - 2¹⁰ = 321131319097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321131320093 and 321131320102.

It is not an unprimeable number, because it can be changed into a prime (321131320127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3838940 + ... + 3921698.

It is an arithmetic number, because the mean of its divisors is an integer number (20521335120).

Almost surely, 2^321131320121 is an apocalyptic number.

It is an amenable number.

321131320121 is a deficient number, since it is larger than the sum of its proper divisors (7210041799).

321131320121 is a wasteful number, since it uses less digits than its factorization.

321131320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83336.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 321131320121 its reverse (121023131123), we get a palindrome (442154451244).

The spelling of 321131320121 in words is "three hundred twenty-one billion, one hundred thirty-one million, three hundred twenty thousand, one hundred twenty-one".