5218421 has 4 divisors (see below), whose sum is σ = 5619852. Its totient is φ = 4816992.

The previous prime is 5218417. The next prime is 5218441. The reversal of 5218421 is 1248125.

5218421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3010225 + 2208196 = 1735^2 + 1486^2 .

It is a cyclic number.

It is not a de Polignac number, because 5218421 - 2² = 5218417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5218441) 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, 200696 + ... + 200721.

It is an arithmetic number, because the mean of its divisors is an integer number (1404963).

Almost surely, 2^5218421 is an apocalyptic number.

It is an amenable number.

5218421 is a deficient number, since it is larger than the sum of its proper divisors (401431).

5218421 is a wasteful number, since it uses less digits than its factorization.

5218421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401430.

The product of its digits is 640, while the sum is 23.

The square root of 5218421 is about 2284.3863508610. The cubic root of 5218421 is about 173.4521567734.

The spelling of 5218421 in words is "five million, two hundred eighteen thousand, four hundred twenty-one".