55237221100 has 72 divisors (see below), whose sum is σ = 128148235488. Its totient is φ = 20593228800.

The previous prime is 55237221043. The next prime is 55237221103. The reversal of 55237221100 is 112273255.

It is not an unprimeable number, because it can be changed into a prime (55237221103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17370 + ... + 332830.

It is an arithmetic number, because the mean of its divisors is an integer number (1779836604).

Almost surely, 2^55237221100 is an apocalyptic number.

55237221100 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 55237221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64074117744).

55237221100 is an abundant number, since it is smaller than the sum of its proper divisors (72911014388).

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

55237221100 is a wasteful number, since it uses less digits than its factorization.

55237221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315595 (or 315588 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

Adding to 55237221100 its reverse (112273255), we get a palindrome (55349494355).

The spelling of 55237221100 in words is "fifty-five billion, two hundred thirty-seven million, two hundred twenty-one thousand, one hundred".