21200210 has 8 divisors (see below), whose sum is σ = 38160396. Its totient is φ = 8480080.

The previous prime is 21200209. The next prime is 21200233. The reversal of 21200210 is 1200212.

It can be written as a sum of positive squares in 2 ways, for example, as 19439281 + 1760929 = 4409^2 + 1327^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060001 + ... + 1060020.

Almost surely, 2^21200210 is an apocalyptic number.

21200210 is a deficient number, since it is larger than the sum of its proper divisors (16960186).

21200210 is a wasteful number, since it uses less digits than its factorization.

21200210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120028.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21200210 is about 4604.3685777748. The cubic root of 21200210 is about 276.7664145742.

Adding to 21200210 its reverse (1200212), we get a palindrome (22400422).

The spelling of 21200210 in words is "twenty-one million, two hundred thousand, two hundred ten".