210640134 has 8 divisors (see below), whose sum is σ = 421280280. Its totient is φ = 70213376.

The previous prime is 210640109. The next prime is 210640151. The reversal of 210640134 is 431046012.

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

210640134 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 210640134.

It is a congruent number.

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, 17553339 + ... + 17553350.

It is an arithmetic number, because the mean of its divisors is an integer number (52660035).

Almost surely, 2^210640134 is an apocalyptic number.

210640134 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

210640134 is a wasteful number, since it uses less digits than its factorization.

210640134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35106694.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 210640134 is about 14513.4466616307. The cubic root of 210640134 is about 594.9955360633.

Adding to 210640134 its reverse (431046012), we get a palindrome (641686146).

The spelling of 210640134 in words is "two hundred ten million, six hundred forty thousand, one hundred thirty-four".