200021220 has 72 divisors (see below), whose sum is σ = 693411264. Its totient is φ = 45718848.

The previous prime is 200021219. The next prime is 200021243. The reversal of 200021220 is 22120002.

200021220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78114 + ... + 80633.

It is an arithmetic number, because the mean of its divisors is an integer number (9630712).

Almost surely, 2^200021220 is an apocalyptic number.

200021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200021220 is an abundant number, since it is smaller than the sum of its proper divisors (493390044).

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

200021220 is a wasteful number, since it uses less digits than its factorization.

200021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158769 (or 158764 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 200021220 is about 14142.8858441267. The cubic root of 200021220 is about 584.8242294633.

Adding to 200021220 its reverse (22120002), we get a palindrome (222141222).

It can be divided in two parts, 2000 and 21220, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 200021220 in words is "two hundred million, twenty-one thousand, two hundred twenty".