203421 has 4 divisors (see below), whose sum is σ = 271232. Its totient is φ = 135612.

The previous prime is 203419. The next prime is 203429. The reversal of 203421 is 124302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 203421 - 2¹ = 203419 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203397 and 203406.

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 203421.

It is not an unprimeable number, because it can be changed into a prime (203429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33901 + ... + 33906.

It is an arithmetic number, because the mean of its divisors is an integer number (67808).

2²⁰³⁴²¹ is an apocalyptic number.

It is an amenable number.

203421 is a deficient number, since it is larger than the sum of its proper divisors (67811).

203421 is an equidigital number, since it uses as much as digits as its factorization.

203421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67810.

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

The square root of 203421 is about 451.0221724040. The cubic root of 203421 is about 58.8119069783.

Adding to 203421 its reverse (124302), we get a palindrome (327723).

The spelling of 203421 in words is "two hundred three thousand, four hundred twenty-one", and thus it is an iban number.