221201100200 has 24 divisors (see below), whose sum is σ = 514292558430. Its totient is φ = 88480440000.

The previous prime is 221201100193. The next prime is 221201100209. The reversal of 221201100200 is 2001102122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 185349192484 + 35851907716 = 430522^2 + 189346^2 .

It is not an unprimeable number, because it can be changed into a prime (221201100209) 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, 553002551 + ... + 553002950.

Almost surely, 2^221201100200 is an apocalyptic number.

221201100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201100200 is an abundant number, since it is smaller than the sum of its proper divisors (293091458230).

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

221201100200 is a wasteful number, since it uses less digits than its factorization.

221201100200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106005517 (or 1106005508 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221201100200 its reverse (2001102122), we get a palindrome (223202202322).

The spelling of 221201100200 in words is "two hundred twenty-one billion, two hundred one million, one hundred thousand, two hundred".