5550430021 has 4 divisors (see below), whose sum is σ = 5554370700. Its totient is φ = 5546489344.

The previous prime is 5550430019. The next prime is 5550430027. The reversal of 5550430021 is 1200340555.

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 1803276225 + 3747153796 = 42465^2 + 61214^2 .

It is a cyclic number.

It is not a de Polignac number, because 5550430021 - 2¹ = 5550430019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5550430027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1968226 + ... + 1971043.

It is an arithmetic number, because the mean of its divisors is an integer number (1388592675).

Almost surely, 2^5550430021 is an apocalyptic number.

It is an amenable number.

5550430021 is a deficient number, since it is larger than the sum of its proper divisors (3940679).

5550430021 is a wasteful number, since it uses less digits than its factorization.

5550430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940678.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 5550430021 is about 74501.2081848342. The cubic root of 5550430021 is about 1770.5527783934.

Adding to 5550430021 its reverse (1200340555), we get a palindrome (6750770576).

The spelling of 5550430021 in words is "five billion, five hundred fifty million, four hundred thirty thousand, twenty-one".