55052221 has 8 divisors (see below), whose sum is σ = 63216704. Its totient is φ = 46962720.

The previous prime is 55052219. The next prime is 55052243. The reversal of 55052221 is 12225055.

55052221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 55052221 - 2¹ = 55052219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55052192 and 55052201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55052281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17160 + ... + 20113.

It is an arithmetic number, because the mean of its divisors is an integer number (7902088).

Almost surely, 2^55052221 is an apocalyptic number.

It is an amenable number.

55052221 is a deficient number, since it is larger than the sum of its proper divisors (8164483).

55052221 is a wasteful number, since it uses less digits than its factorization.

55052221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37491.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 55052221 is about 7419.7183908825. The cubic root of 55052221 is about 380.4155679915.

Adding to 55052221 its reverse (12225055), we get a palindrome (67277276).

The spelling of 55052221 in words is "fifty-five million, fifty-two thousand, two hundred twenty-one".