4208421 has 8 divisors (see below), whose sum is σ = 6412864. Its totient is φ = 2404800.

The previous prime is 4208419. The next prime is 4208429. The reversal of 4208421 is 1248024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4208421 - 2¹ = 4208419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 200401 = 4208421 / (4 + 2 + 0 + 8 + 4 + 2 + 1).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4208429) 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, 100180 + ... + 100221.

It is an arithmetic number, because the mean of its divisors is an integer number (801608).

Almost surely, 2^4208421 is an apocalyptic number.

It is an amenable number.

4208421 is a deficient number, since it is larger than the sum of its proper divisors (2204443).

4208421 is a wasteful number, since it uses less digits than its factorization.

4208421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200411.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 4208421 is about 2051.4436380266. The cubic root of 4208421 is about 161.4506234302.

The spelling of 4208421 in words is "four million, two hundred eight thousand, four hundred twenty-one".