550451440343221 has 16 divisors (see below), whose sum is σ = 556143818134320. Its totient is φ = 544783500656640.

The previous prime is 550451440343219. The next prime is 550451440343227. The reversal of 550451440343221 is 122343044154055.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 60775838524996 + 489675601818225 = 7795886^2 + 22128615^2 .

It is a cyclic number.

It is not a de Polignac number, because 550451440343221 - 2¹ = 550451440343219 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 (550451440343227) 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, 908349195 + ... + 908954983.

It is an arithmetic number, because the mean of its divisors is an integer number (34758988633395).

Almost surely, 2^{550451440343221} is an apocalyptic number.

It is an amenable number.

550451440343221 is a deficient number, since it is larger than the sum of its proper divisors (5692377791099).

550451440343221 is a wasteful number, since it uses less digits than its factorization.

550451440343221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625944.

The product of its (nonzero) digits is 1152000, while the sum is 43.

Adding to 550451440343221 its reverse (122343044154055), we get a palindrome (672794484497276).

The spelling of 550451440343221 in words is "five hundred fifty trillion, four hundred fifty-one billion, four hundred forty million, three hundred forty-three thousand, two hundred twenty-one".