55016221 has 8 divisors (see below), whose sum is σ = 60626720. Its totient is φ = 49602672.

The previous prime is 55016189. The next prime is 55016237. The reversal of 55016221 is 12261055.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55016221 - 2⁵ = 55016189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55016192 and 55016201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55016251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48651 + ... + 49768.

It is an arithmetic number, because the mean of its divisors is an integer number (7578340).

Almost surely, 2^55016221 is an apocalyptic number.

It is an amenable number.

55016221 is a deficient number, since it is larger than the sum of its proper divisors (5610499).

55016221 is a wasteful number, since it uses less digits than its factorization.

55016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98475.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 55016221 is about 7417.2920260699. The cubic root of 55016221 is about 380.3326288812.

Adding to 55016221 its reverse (12261055), we get a palindrome (67277276).

The spelling of 55016221 in words is "fifty-five million, sixteen thousand, two hundred twenty-one".