200121220 has 48 divisors (see below), whose sum is σ = 458357760. Its totient is φ = 72948096.

The previous prime is 200121211. The next prime is 200121221. The reversal of 200121220 is 22121002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 200121197 and 200121206.

It is not an unprimeable number, because it can be changed into a prime (200121221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15669 + ... + 25411.

It is an arithmetic number, because the mean of its divisors is an integer number (9549120).

Almost surely, 2^200121220 is an apocalyptic number.

200121220 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 200121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229178880).

200121220 is an abundant number, since it is smaller than the sum of its proper divisors (258236540).

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

200121220 is a wasteful number, since it uses less digits than its factorization.

200121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9844 (or 9842 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 200121220 is about 14146.4207487265. The cubic root of 200121220 is about 584.9216735905.

Adding to 200121220 its reverse (22121002), we get a palindrome (222242222).

The spelling of 200121220 in words is "two hundred million, one hundred twenty-one thousand, two hundred twenty".