321123121 has 4 divisors (see below), whose sum is σ = 350316144. Its totient is φ = 291930100.

The previous prime is 321123109. The next prime is 321123133. The reversal of 321123121 is 121321123.

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.

It is an interprime number because it is at equal distance from previous prime (321123109) and next prime (321123133).

It is not a de Polignac number, because 321123121 - 2¹⁵ = 321090353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321123095 and 321123104.

It is not an unprimeable number, because it can be changed into a prime (321123191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14596495 + ... + 14596516.

It is an arithmetic number, because the mean of its divisors is an integer number (87579036).

Almost surely, 2^321123121 is an apocalyptic number.

It is an amenable number.

321123121 is a deficient number, since it is larger than the sum of its proper divisors (29193023).

321123121 is a wasteful number, since it uses less digits than its factorization.

321123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29193022.

The product of its digits is 72, while the sum is 16.

The square root of 321123121 is about 17919.9085098111. The cubic root of 321123121 is about 684.7896567655.

Adding to 321123121 its reverse (121321123), we get a palindrome (442444244).

It can be divided in two parts, 321123 and 121, that multiplied together give a palindrome (38855883).

The spelling of 321123121 in words is "three hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty-one".