320421 has 12 divisors (see below), whose sum is σ = 445952. Its totient is φ = 204624.

The previous prime is 320417. The next prime is 320431. The reversal of 320421 is 124023.

It is not a de Polignac number, because 320421 - 2² = 320417 is a prime.

It is a Duffinian number.

320421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 320397 and 320406.

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 320421.

It is not an unprimeable number, because it can be changed into a prime (320401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2460 + ... + 2586.

2³²⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

320421 is a deficient number, since it is larger than the sum of its proper divisors (125531).

320421 is a wasteful number, since it uses less digits than its factorization.

320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 320421 is about 566.0574175824. The cubic root of 320421 is about 68.4290205503.

Adding to 320421 its reverse (124023), we get a palindrome (444444).

It can be divided in two parts, 320 and 421, that added together give a triangular number (741 = T₃₈).

The spelling of 320421 in words is "three hundred twenty thousand, four hundred twenty-one", and thus it is an iban number.