550050021 has 10 divisors (see below), whose sum is σ = 821679782. Its totient is φ = 366699960.

The previous prime is 550049959. The next prime is 550050031. The reversal of 550050021 is 120050055.

It can be written as a sum of positive squares in only one way, i.e., 476330625 + 73719396 = 21825^2 + 8586^2 .

It is not a de Polignac number, because 550050021 - 2¹⁰ = 550048997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 550049976 and 550050003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550050031) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3395290 + ... + 3395451.

Almost surely, 2^550050021 is an apocalyptic number.

It is an amenable number.

550050021 is a deficient number, since it is larger than the sum of its proper divisors (271629761).

550050021 is an equidigital number, since it uses as much as digits as its factorization.

550050021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6790753 (or 6790744 counting only the distinct ones).

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

The square root of 550050021 is about 23453.1452261738. The cubic root of 550050021 is about 819.3461081927.

The spelling of 550050021 in words is "five hundred fifty million, fifty thousand, twenty-one".