220021210 has 8 divisors (see below), whose sum is σ = 396038196. Its totient is φ = 88008480.

The previous prime is 220021183. The next prime is 220021253. The reversal of 220021210 is 12120022.

220021210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 215238241 + 4782969 = 14671^2 + 2187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 22002121 = 220021210 / (2 + 2 + 0 + 0 + 2 + 1 + 2 + 1 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11001051 + ... + 11001070.

Almost surely, 2^220021210 is an apocalyptic number.

220021210 is a deficient number, since it is larger than the sum of its proper divisors (176016986).

220021210 is a wasteful number, since it uses less digits than its factorization.

220021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22002128.

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

The square root of 220021210 is about 14833.1119459134. Note that the first 3 decimals coincide. The cubic root of 220021210 is about 603.7004731709.

Adding to 220021210 its reverse (12120022), we get a palindrome (232141232).

The spelling of 220021210 in words is "two hundred twenty million, twenty-one thousand, two hundred ten".