55448421 has 16 divisors (see below), whose sum is σ = 85113984. Its totient is φ = 31451904.

The previous prime is 55448389. The next prime is 55448431. The reversal of 55448421 is 12484455.

It is a happy number.

55448421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55448421 - 2⁵ = 55448389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55448431) 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 15 ways as a sum of consecutive naturals, for example, 6760 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (5319624).

Almost surely, 2^55448421 is an apocalyptic number.

It is an amenable number.

55448421 is a deficient number, since it is larger than the sum of its proper divisors (29665563).

55448421 is a wasteful number, since it uses less digits than its factorization.

55448421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19420.

The product of its digits is 25600, while the sum is 33.

The square root of 55448421 is about 7446.3696523877. The cubic root of 55448421 is about 381.3259794463.

The spelling of 55448421 in words is "fifty-five million, four hundred forty-eight thousand, four hundred twenty-one".