321355 has 4 divisors (see below), whose sum is σ = 385632. Its totient is φ = 257080.

The previous prime is 321341. The next prime is 321359. The reversal of 321355 is 553123.

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

It is not a de Polignac number, because 321355 - 2⁵ = 321323 is a prime.

It is a Duffinian number.

321355 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (321359) 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 3 ways as a sum of consecutive naturals, for example, 32131 + ... + 32140.

It is an arithmetic number, because the mean of its divisors is an integer number (96408).

2³²¹³⁵⁵ is an apocalyptic number.

321355 is a deficient number, since it is larger than the sum of its proper divisors (64277).

321355 is an equidigital number, since it uses as much as digits as its factorization.

321355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64276.

The product of its digits is 450, while the sum is 19.

The square root of 321355 is about 566.8818218994. The cubic root of 321355 is about 68.4954443131.

Adding to 321355 its reverse (553123), we get a palindrome (874478).

It can be divided in two parts, 3213 and 55, that multiplied together give a triangular number (176715 = T₅₉₄).

The spelling of 321355 in words is "three hundred twenty-one thousand, three hundred fifty-five".