55020321200 has 120 divisors (see below), whose sum is σ = 142517576208. Its totient is φ = 20291927040.

The previous prime is 55020321149. The next prime is 55020321241. The reversal of 55020321200 is 212302055.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4918814 + ... + 4929986.

Almost surely, 2^55020321200 is an apocalyptic number.

55020321200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55020321200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71258788104).

55020321200 is an abundant number, since it is smaller than the sum of its proper divisors (87497255008).

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

55020321200 is a wasteful number, since it uses less digits than its factorization.

55020321200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12151 (or 12140 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 55020321200 its reverse (212302055), we get a palindrome (55232623255).

The spelling of 55020321200 in words is "fifty-five billion, twenty million, three hundred twenty-one thousand, two hundred".