321231112121 has 4 divisors (see below), whose sum is σ = 321232483044. Its totient is φ = 321229741200.

The previous prime is 321231112099. The next prime is 321231112151. The reversal of 321231112121 is 121211132123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121211132123 = 1451 ⋅83536273.

It can be written as a sum of positive squares in 2 ways, for example, as 288890125225 + 32340986896 = 537485^2 + 179836^2 .

It is a cyclic number.

It is not a de Polignac number, because 321231112121 - 2³⁸ = 46353205177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321231112093 and 321231112102.

It is not an unprimeable number, because it can be changed into a prime (321231112151) 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 3 ways as a sum of consecutive naturals, for example, 235550 + ... + 835431.

It is an arithmetic number, because the mean of its divisors is an integer number (80308120761).

Almost surely, 2^321231112121 is an apocalyptic number.

It is an amenable number.

321231112121 is a deficient number, since it is larger than the sum of its proper divisors (1370923).

321231112121 is a wasteful number, since it uses less digits than its factorization.

321231112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370922.

The product of its digits is 144, while the sum is 20.

Adding to 321231112121 its reverse (121211132123), we get a palindrome (442442244244).

The spelling of 321231112121 in words is "three hundred twenty-one billion, two hundred thirty-one million, one hundred twelve thousand, one hundred twenty-one".