216424073 has 4 divisors (see below), whose sum is σ = 216455748. Its totient is φ = 216392400.

The previous prime is 216424057. The next prime is 216424081. The reversal of 216424073 is 370424612.

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 108326464 + 108097609 = 10408^2 + 10397^2 .

It is a cyclic number.

It is not a de Polignac number, because 216424073 - 2⁴ = 216424057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216424973) 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, 878 + ... + 20823.

It is an arithmetic number, because the mean of its divisors is an integer number (54113937).

Almost surely, 2^216424073 is an apocalyptic number.

It is an amenable number.

216424073 is a deficient number, since it is larger than the sum of its proper divisors (31675).

216424073 is an equidigital number, since it uses as much as digits as its factorization.

216424073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31674.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 216424073 is about 14711.3586388205. The cubic root of 216424073 is about 600.3924034951.

Adding to 216424073 its reverse (370424612), we get a palindrome (586848685).

The spelling of 216424073 in words is "two hundred sixteen million, four hundred twenty-four thousand, seventy-three".