55221384 has 16 divisors (see below), whose sum is σ = 138053520. Its totient is φ = 18407120.

The previous prime is 55221379. The next prime is 55221403. The reversal of 55221384 is 48312255.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150422 + ... + 1150469.

It is an arithmetic number, because the mean of its divisors is an integer number (8628345).

Almost surely, 2^55221384 is an apocalyptic number.

It is an amenable number.

55221384 is an abundant number, since it is smaller than the sum of its proper divisors (82832136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55221384 is a wasteful number, since it uses less digits than its factorization.

55221384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300900 (or 2300896 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 55221384 is about 7431.1092038807. The cubic root of 55221384 is about 380.8048131880.

The spelling of 55221384 in words is "fifty-five million, two hundred twenty-one thousand, three hundred eighty-four".