216230345 has 4 divisors (see below), whose sum is σ = 259476420. Its totient is φ = 172984272.

The previous prime is 216230341. The next prime is 216230353. The reversal of 216230345 is 543032612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83704201 + 132526144 = 9149^2 + 11512^2 .

It is a cyclic number.

It is not a de Polignac number, because 216230345 - 2² = 216230341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216230341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21623030 + ... + 21623039.

It is an arithmetic number, because the mean of its divisors is an integer number (64869105).

Almost surely, 2^216230345 is an apocalyptic number.

It is an amenable number.

216230345 is a deficient number, since it is larger than the sum of its proper divisors (43246075).

216230345 is an equidigital number, since it uses as much as digits as its factorization.

216230345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43246074.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 216230345 is about 14704.7728646178. The cubic root of 216230345 is about 600.2132066367.

Adding to 216230345 its reverse (543032612), we get a palindrome (759262957).

The spelling of 216230345 in words is "two hundred sixteen million, two hundred thirty thousand, three hundred forty-five".