550345021 has 2 divisors, whose sum is σ = 550345022. Its totient is φ = 550345020.

The previous prime is 550345001. The next prime is 550345073. The reversal of 550345021 is 120543055.

550345021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 365765625 + 184579396 = 19125^2 + 13586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550345021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550345001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275172510 + 275172511.

It is an arithmetic number, because the mean of its divisors is an integer number (275172511).

Almost surely, 2^550345021 is an apocalyptic number.

It is an amenable number.

550345021 is a deficient number, since it is larger than the sum of its proper divisors (1).

550345021 is an equidigital number, since it uses as much as digits as its factorization.

550345021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 550345021 is about 23459.4335183099. The cubic root of 550345021 is about 819.4925578459.

Adding to 550345021 its reverse (120543055), we get a palindrome (670888076).

The spelling of 550345021 in words is "five hundred fifty million, three hundred forty-five thousand, twenty-one".