55004421220 has 96 divisors (see below), whose sum is σ = 137257908480. Its totient is φ = 18115668480.

The previous prime is 55004421211. The next prime is 55004421259. The reversal of 55004421220 is 2212440055.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 765435 + ... + 834205.

It is an arithmetic number, because the mean of its divisors is an integer number (1429769880).

Almost surely, 2^55004421220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55004421220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68628954240).

55004421220 is an abundant number, since it is smaller than the sum of its proper divisors (82253487260).

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

55004421220 is a wasteful number, since it uses less digits than its factorization.

55004421220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69013 (or 69011 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 55004421220 its reverse (2212440055), we get a palindrome (57216861275).

The spelling of 55004421220 in words is "fifty-five billion, four million, four hundred twenty-one thousand, two hundred twenty".