538550221 has 16 divisors (see below), whose sum is σ = 622222848. Its totient is φ = 461300400.

The previous prime is 538550183. The next prime is 538550237. The reversal of 538550221 is 122055835.

538550221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 538550221 - 2¹⁵ = 538517453 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 (538550261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1066 + ... + 32836.

It is an arithmetic number, because the mean of its divisors is an integer number (38888928).

Almost surely, 2^538550221 is an apocalyptic number.

It is an amenable number.

538550221 is a deficient number, since it is larger than the sum of its proper divisors (83672627).

538550221 is a wasteful number, since it uses less digits than its factorization.

538550221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31872.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 538550221 is about 23206.6848343317. The cubic root of 538550221 is about 813.5958715109.

The spelling of 538550221 in words is "five hundred thirty-eight million, five hundred fifty thousand, two hundred twenty-one".