321122112121 has 4 divisors (see below), whose sum is σ = 321141042000. Its totient is φ = 321103182244.

The previous prime is 321122112109. The next prime is 321122112137. The reversal of 321122112121 is 121211221123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121211221123 = 270923 ⋅447401.

It is a cyclic number.

It is not a de Polignac number, because 321122112121 - 2³¹ = 318974628473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321122112191) 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 3 ways as a sum of consecutive naturals, for example, 9439471 + ... + 9473428.

It is an arithmetic number, because the mean of its divisors is an integer number (80285260500).

Almost surely, 2^321122112121 is an apocalyptic number.

It is an amenable number.

321122112121 is a deficient number, since it is larger than the sum of its proper divisors (18929879).

321122112121 is a wasteful number, since it uses less digits than its factorization.

321122112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18929878.

The product of its digits is 96, while the sum is 19.

Adding to 321122112121 its reverse (121211221123), we get a palindrome (442333333244).

The spelling of 321122112121 in words is "three hundred twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, one hundred twenty-one".