208421 has 8 divisors (see below), whose sum is σ = 220704. Its totient is φ = 196560.

The previous prime is 208409. The next prime is 208433. The reversal of 208421 is 124802.

208421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (208409) and next prime (208433).

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 208421 - 2¹⁴ = 192037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 208421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208441) 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, 1526 + ... + 1656.

It is an arithmetic number, because the mean of its divisors is an integer number (27588).

2²⁰⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

208421 is a deficient number, since it is larger than the sum of its proper divisors (12283).

208421 is a wasteful number, since it uses less digits than its factorization.

208421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 208421 is about 456.5314885087. The cubic root of 208421 is about 59.2898691349.

The spelling of 208421 in words is "two hundred eight thousand, four hundred twenty-one".