221134550 has 144 divisors (see below), whose sum is σ = 528997392. Its totient is φ = 68140800.

The previous prime is 221134549. The next prime is 221134561. The reversal of 221134550 is 55431122.

221134550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 1687985 + ... + 1688115.

It is an arithmetic number, because the mean of its divisors is an integer number (3673593).

Almost surely, 2^221134550 is an apocalyptic number.

221134550 is an abundant number, since it is smaller than the sum of its proper divisors (307862842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221134550 is a wasteful number, since it uses less digits than its factorization.

221134550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 221134550 is about 14870.5934649563. The cubic root of 221134550 is about 604.7170318000.

Adding to 221134550 its reverse (55431122), we get a palindrome (276565672).

The spelling of 221134550 in words is "two hundred twenty-one million, one hundred thirty-four thousand, five hundred fifty".