217430330 has 24 divisors (see below), whose sum is σ = 423799452. Its totient is φ = 80281344.

The previous prime is 217430309. The next prime is 217430341. The reversal of 217430330 is 33034712.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 12453841 + 204976489 = 3529^2 + 14317^2 .

It is a junction number, because it is equal to n+sod(n) for n = 217430296 and 217430305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62639 + ... + 66018.

Almost surely, 2^217430330 is an apocalyptic number.

217430330 is a deficient number, since it is larger than the sum of its proper divisors (206369122).

217430330 is a wasteful number, since it uses less digits than its factorization.

217430330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128690 (or 128677 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 217430330 is about 14745.5189803547. The cubic root of 217430330 is about 601.3214670344.

The spelling of 217430330 in words is "two hundred seventeen million, four hundred thirty thousand, three hundred thirty".