210105210 has 128 divisors (see below), whose sum is σ = 615237120. Its totient is φ = 44826624.

The previous prime is 210105209. The next prime is 210105221. The reversal of 210105210 is 12501012.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 817402 + ... + 817658.

It is an arithmetic number, because the mean of its divisors is an integer number (4806540).

Almost surely, 2^210105210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210105210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307618560).

210105210 is an abundant number, since it is smaller than the sum of its proper divisors (405131910).

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

210105210 is a wasteful number, since it uses less digits than its factorization.

210105210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 210105210 is about 14495.0063815095. The cubic root of 210105210 is about 594.4914422005.

Adding to 210105210 its reverse (12501012), we get a palindrome (222606222).

The spelling of 210105210 in words is "two hundred ten million, one hundred five thousand, two hundred ten".