5550021 has 6 divisors (see below), whose sum is σ = 8016710. Its totient is φ = 3700008.

The previous prime is 5550019. The next prime is 5550029. The reversal of 5550021 is 1200555.

5550021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 1920996 = 1905^2 + 1386^2 .

It is not a de Polignac number, because 5550021 - 2¹ = 5550019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5549976 and 5550003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5550029) 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 5 ways as a sum of consecutive naturals, for example, 308326 + ... + 308343.

Almost surely, 2^5550021 is an apocalyptic number.

It is an amenable number.

5550021 is a deficient number, since it is larger than the sum of its proper divisors (2466689).

5550021 is a wasteful number, since it uses less digits than its factorization.

5550021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616675 (or 616672 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 5550021 is about 2355.8482548755. The cubic root of 5550021 is about 177.0509285604.

Adding to 5550021 its reverse (1200555), we get a palindrome (6750576).

The spelling of 5550021 in words is "five million, five hundred fifty thousand, twenty-one".