55021100 has 18 divisors (see below), whose sum is σ = 119396004. Its totient is φ = 22008400.

The previous prime is 55021097. The next prime is 55021103. The reversal of 55021100 is 112055.

55021100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55021097) and next prime (55021103).

It is not an unprimeable number, because it can be changed into a prime (55021103) 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 5 ways as a sum of consecutive naturals, for example, 275006 + ... + 275205.

Almost surely, 2^55021100 is an apocalyptic number.

55021100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55021100 is an abundant number, since it is smaller than the sum of its proper divisors (64374904).

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

55021100 is a wasteful number, since it uses less digits than its factorization.

55021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550225 (or 550218 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 55021100 is about 7417.6209123950. The cubic root of 55021100 is about 380.3438715536.

Adding to 55021100 its reverse (112055), we get a palindrome (55133155).

The spelling of 55021100 in words is "fifty-five million, twenty-one thousand, one hundred".