210009312 has 36 divisors (see below), whose sum is σ = 597214800. Its totient is φ = 70003008.

The previous prime is 210009311. The next prime is 210009361. The reversal of 210009312 is 213900012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×210009312² = 88207822253426688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210009311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364312 + ... + 364887.

It is an arithmetic number, because the mean of its divisors is an integer number (16589300).

Almost surely, 2^210009312 is an apocalyptic number.

It is an amenable number.

210009312 is an abundant number, since it is smaller than the sum of its proper divisors (387205488).

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

210009312 is a wasteful number, since it uses less digits than its factorization.

210009312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729215 (or 729204 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 210009312 is about 14491.6980371522. The cubic root of 210009312 is about 594.4009808292.

Adding to 210009312 its reverse (213900012), we get a palindrome (423909324).

The spelling of 210009312 in words is "two hundred ten million, nine thousand, three hundred twelve".