213130816 has 14 divisors (see below), whose sum is σ = 422931590. Its totient is φ = 106565376.

The previous prime is 213130783. The next prime is 213130817. The reversal of 213130816 is 618031312.

It can be written as a sum of positive squares in only one way, i.e., 204604416 + 8526400 = 14304^2 + 2920^2 .

It is not an unprimeable number, because it can be changed into a prime (213130817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665021 + ... + 1665148.

Almost surely, 2^213130816 is an apocalyptic number.

It is an amenable number.

213130816 is a deficient number, since it is larger than the sum of its proper divisors (209800774).

213130816 is an equidigital number, since it uses as much as digits as its factorization.

213130816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330181 (or 3330171 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 213130816 is about 14599.0005137338. Note that the first 3 decimals coincide. The cubic root of 213130816 is about 597.3314975673.

The spelling of 213130816 in words is "two hundred thirteen million, one hundred thirty thousand, eight hundred sixteen".