221221030200 has 96 divisors (see below), whose sum is σ = 686466740400. Its totient is φ = 58933647360.

The previous prime is 221221030189. The next prime is 221221030201. The reversal of 221221030200 is 2030122122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221221030200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221030201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 422694 + ... + 788106.

Almost surely, 2^221221030200 is an apocalyptic number.

221221030200 is a gapful number since it is divisible by the number (20) 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 221221030200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343233370200).

221221030200 is an abundant number, since it is smaller than the sum of its proper divisors (465245710200).

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

221221030200 is a wasteful number, since it uses less digits than its factorization.

221221030200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366441 (or 366432 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 221221030200 its reverse (2030122122), we get a palindrome (223251152322).

The spelling of 221221030200 in words is "two hundred twenty-one billion, two hundred twenty-one million, thirty thousand, two hundred".