321811121 has 8 divisors (see below), whose sum is σ = 327541824. Its totient is φ = 316113840.

The previous prime is 321811111. The next prime is 321811129. The reversal of 321811121 is 121118123.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321811121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321811093 and 321811102.

It is not an unprimeable number, because it can be changed into a prime (321811129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11486 + ... + 27848.

It is an arithmetic number, because the mean of its divisors is an integer number (40942728).

Almost surely, 2^321811121 is an apocalyptic number.

It is an amenable number.

321811121 is a deficient number, since it is larger than the sum of its proper divisors (5730703).

321811121 is a wasteful number, since it uses less digits than its factorization.

321811121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16711.

The product of its digits is 96, while the sum is 20.

The square root of 321811121 is about 17939.0947653442. The cubic root of 321811121 is about 685.2783573987.

Adding to 321811121 its reverse (121118123), we get a palindrome (442929244).

The spelling of 321811121 in words is "three hundred twenty-one million, eight hundred eleven thousand, one hundred twenty-one".