213130784 has 12 divisors (see below), whose sum is σ = 419601294. Its totient is φ = 106565376.

The previous prime is 213130783. The next prime is 213130817. The reversal of 213130784 is 487031312.

It can be written as a sum of positive squares in only one way, i.e., 154455184 + 58675600 = 12428^2 + 7660^2 .

It is not an unprimeable number, because it can be changed into a prime (213130783) 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, 3330137 + ... + 3330200.

Almost surely, 2^213130784 is an apocalyptic number.

It is an amenable number.

213130784 is a deficient number, since it is larger than the sum of its proper divisors (206470510).

213130784 is an equidigital number, since it uses as much as digits as its factorization.

213130784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6660347 (or 6660339 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 213130784 is about 14598.9994177683. Note that the first 3 decimals coincide. The cubic root of 213130784 is about 597.3314676724.

The spelling of 213130784 in words is "two hundred thirteen million, one hundred thirty thousand, seven hundred eighty-four".