321866 has 4 divisors (see below), whose sum is σ = 482802. Its totient is φ = 160932.

The previous prime is 321851. The next prime is 321889. The reversal of 321866 is 668123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668123 = 89 ⋅7507.

It can be written as a sum of positive squares in only one way, i.e., 279841 + 42025 = 529^2 + 205^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80465 + ... + 80468.

2³²¹⁸⁶⁶ is an apocalyptic number.

321866 is a deficient number, since it is larger than the sum of its proper divisors (160936).

321866 is a wasteful number, since it uses less digits than its factorization.

321866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160935.

The product of its digits is 1728, while the sum is 26.

The square root of 321866 is about 567.3323540924. The cubic root of 321866 is about 68.5317309081.

Adding to 321866 its reverse (668123), we get a palindrome (989989).

The spelling of 321866 in words is "three hundred twenty-one thousand, eight hundred sixty-six".