321312111 has 4 divisors (see below), whose sum is σ = 428416152. Its totient is φ = 214208072.

The previous prime is 321312091. The next prime is 321312113. The reversal of 321312111 is 111213123.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 321312111 - 2¹³ = 321303919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321312113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53552016 + ... + 53552021.

It is an arithmetic number, because the mean of its divisors is an integer number (107104038).

Almost surely, 2^321312111 is an apocalyptic number.

321312111 is a deficient number, since it is larger than the sum of its proper divisors (107104041).

321312111 is a wasteful number, since it uses less digits than its factorization.

321312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107104040.

The product of its digits is 36, while the sum is 15.

The square root of 321312111 is about 17925.1809195891. The cubic root of 321312111 is about 684.9239697525.

Adding to 321312111 its reverse (111213123), we get a palindrome (432525234).

The spelling of 321312111 in words is "three hundred twenty-one million, three hundred twelve thousand, one hundred eleven".