5520821 has 4 divisors (see below), whose sum is σ = 5698944. Its totient is φ = 5342700.

The previous prime is 5520803. The next prime is 5520839. The reversal of 5520821 is 1280255.

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 an interprime number because it is at equal distance from previous prime (5520803) and next prime (5520839).

It is a cyclic number.

It is not a de Polignac number, because 5520821 - 2¹⁰ = 5519797 is a prime.

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 (5520421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89015 + ... + 89076.

It is an arithmetic number, because the mean of its divisors is an integer number (1424736).

Almost surely, 2^5520821 is an apocalyptic number.

It is an amenable number.

5520821 is a deficient number, since it is larger than the sum of its proper divisors (178123).

5520821 is a wasteful number, since it uses less digits than its factorization.

5520821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178122.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 5520821 is about 2349.6427388009. The cubic root of 5520821 is about 176.7398798645.

The spelling of 5520821 in words is "five million, five hundred twenty thousand, eight hundred twenty-one".