55443321 has 12 divisors (see below), whose sum is σ = 80386020. Its totient is φ = 36823200.

The previous prime is 55443301. The next prime is 55443329. The reversal of 55443321 is 12334455.

It can be written as a sum of positive squares in 2 ways, for example, as 31236921 + 24206400 = 5589^2 + 4920^2 .

It is not a de Polignac number, because 55443321 - 2¹⁰ = 55442297 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55443329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9030 + ... + 13871.

It is an arithmetic number, because the mean of its divisors is an integer number (6698835).

Almost surely, 2^55443321 is an apocalyptic number.

It is an amenable number.

55443321 is a deficient number, since it is larger than the sum of its proper divisors (24942699).

55443321 is a wasteful number, since it uses less digits than its factorization.

55443321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23176 (or 23173 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 55443321 is about 7446.0271957602. The cubic root of 55443321 is about 381.3142879674.

Adding to 55443321 its reverse (12334455), we get a palindrome (67777776).

The spelling of 55443321 in words is "fifty-five million, four hundred forty-three thousand, three hundred twenty-one".