221121220200 has 192 divisors, whose sum is σ = 729813913920. Its totient is φ = 55190016000.

The previous prime is 221121220163. The next prime is 221121220207. The reversal of 221121220200 is 2022121122.

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 221121220200.

It is not an unprimeable number, because it can be changed into a prime (221121220207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1786315 + ... + 1906085.

It is an arithmetic number, because the mean of its divisors is an integer number (3801114135).

Almost surely, 2^221121220200 is an apocalyptic number.

221121220200 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 221121220200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364906956960).

221121220200 is an abundant number, since it is smaller than the sum of its proper divisors (508692693720).

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

221121220200 is a wasteful number, since it uses less digits than its factorization.

221121220200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119988 (or 119979 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221121220200 its reverse (2022121122), we get a palindrome (223143341322).

The spelling of 221121220200 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, two hundred".