5220421 has 6 divisors (see below), whose sum is σ = 5510022. Its totient is φ = 4945320.

The previous prime is 5220409. The next prime is 5220427. The reversal of 5220421 is 1240225.

It can be written as a sum of positive squares in only one way, i.e., 3189796 + 2030625 = 1786^2 + 1425^2 .

It is not a de Polignac number, because 5220421 - 2⁵ = 5220389 is a prime.

It is a Duffinian number.

5220421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5220395 and 5220404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5220427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6870 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (918337).

Almost surely, 2^5220421 is an apocalyptic number.

It is an amenable number.

5220421 is a deficient number, since it is larger than the sum of its proper divisors (289601).

5220421 is a wasteful number, since it uses less digits than its factorization.

5220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14499 (or 14480 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 5220421 is about 2284.8240632486. The cubic root of 5220421 is about 173.4743129011.

Adding to 5220421 its reverse (1240225), we get a palindrome (6460646).

It can be divided in two parts, 52204 and 21, that added together give a palindrome (52225).

The spelling of 5220421 in words is "five million, two hundred twenty thousand, four hundred twenty-one".