210312225 has 18 divisors (see below), whose sum is σ = 376692966. Its totient is φ = 112166400.

The previous prime is 210312211. The next prime is 210312227. The reversal of 210312225 is 522213012.

It can be written as a sum of positive squares in 3 ways, for example, as 11840481 + 198471744 = 3441^2 + 14088^2 .

It is not a de Polignac number, because 210312225 - 2⁴ = 210312209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210312198 and 210312207.

It is not an unprimeable number, because it can be changed into a prime (210312227) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 467136 + ... + 467585.

It is an arithmetic number, because the mean of its divisors is an integer number (20927387).

Almost surely, 2^210312225 is an apocalyptic number.

210312225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

210312225 is a deficient number, since it is larger than the sum of its proper divisors (166380741).

210312225 is a wasteful number, since it uses less digits than its factorization.

210312225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934737 (or 934729 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 210312225 is about 14502.1455309206. The cubic root of 210312225 is about 594.6866273469.

Adding to 210312225 its reverse (522213012), we get a palindrome (732525237).

The spelling of 210312225 in words is "two hundred ten million, three hundred twelve thousand, two hundred twenty-five".