321122122121 has 4 divisors (see below), whose sum is σ = 328954369044. Its totient is φ = 313289875200.

The previous prime is 321122122109. The next prime is 321122122129. The reversal of 321122122121 is 121221221123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144524666896 + 176597455225 = 380164^2 + 420235^2 .

It is a cyclic number.

It is not a de Polignac number, because 321122122121 - 2¹⁰ = 321122121097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321122122093 and 321122122102.

It is not an unprimeable number, because it can be changed into a prime (321122122129) 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, 3916123400 + ... + 3916123481.

It is an arithmetic number, because the mean of its divisors is an integer number (82238592261).

Almost surely, 2^321122122121 is an apocalyptic number.

It is an amenable number.

321122122121 is a deficient number, since it is larger than the sum of its proper divisors (7832246923).

321122122121 is an equidigital number, since it uses as much as digits as its factorization.

321122122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832246922.

The product of its digits is 192, while the sum is 20.

Adding to 321122122121 its reverse (121221221123), we get a palindrome (442343343244).

The spelling of 321122122121 in words is "three hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".