321861 has 8 divisors (see below), whose sum is σ = 454464. Its totient is φ = 201920.

The previous prime is 321851. The next prime is 321889. The reversal of 321861 is 168123.

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

It is a cyclic number.

It is not a de Polignac number, because 321861 - 2⁵ = 321829 is a prime.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 321861.

It is not an unprimeable number, because it can be changed into a prime (321821) 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, 3105 + ... + 3206.

It is an arithmetic number, because the mean of its divisors is an integer number (56808).

2³²¹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

321861 is a deficient number, since it is larger than the sum of its proper divisors (132603).

321861 is a wasteful number, since it uses less digits than its factorization.

321861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6331.

The product of its digits is 288, while the sum is 21.

The square root of 321861 is about 567.3279474872. The cubic root of 321861 is about 68.5313760395.

Adding to 321861 its reverse (168123), we get a palindrome (489984).

The spelling of 321861 in words is "three hundred twenty-one thousand, eight hundred sixty-one".