321381 has 8 divisors (see below), whose sum is σ = 476160. Its totient is φ = 214236.

The previous prime is 321371. The next prime is 321383. The reversal of 321381 is 183123.

321381 is nontrivially palindromic in base 15.

It is a de Polignac number, because none of the positive numbers 2^k-321381 is a prime.

It is a super-2 number, since 2×321381² = 206571494322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5925 + ... + 5978.

It is an arithmetic number, because the mean of its divisors is an integer number (59520).

2³²¹³⁸¹ is an apocalyptic number.

It is an amenable number.

321381 is a deficient number, since it is larger than the sum of its proper divisors (154779).

321381 is a wasteful number, since it uses less digits than its factorization.

321381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11912 (or 11906 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 321381 is about 566.9047539049. The cubic root of 321381 is about 68.4972915263.

The spelling of 321381 in words is "three hundred twenty-one thousand, three hundred eighty-one".