221100200 has 24 divisors (see below), whose sum is σ = 514058430. Its totient is φ = 88440000.

The previous prime is 221100193. The next prime is 221100203. The reversal of 221100200 is 2001122.

221100200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 214739716 + 6360484 = 14654^2 + 2522^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is not an unprimeable number, because it can be changed into a prime (221100203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 552551 + ... + 552950.

Almost surely, 2^221100200 is an apocalyptic number.

221100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221100200 is an abundant number, since it is smaller than the sum of its proper divisors (292958230).

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

221100200 is a wasteful number, since it uses less digits than its factorization.

221100200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105517 (or 1105508 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 221100200 is about 14869.4384561086. The cubic root of 221100200 is about 604.6857188796.

Adding to 221100200 its reverse (2001122), we get a palindrome (223101322).

The spelling of 221100200 in words is "two hundred twenty-one million, one hundred thousand, two hundred".