216707243 has 4 divisors (see below), whose sum is σ = 216791760. Its totient is φ = 216622728.

The previous prime is 216707221. The next prime is 216707251. The reversal of 216707243 is 342707612.

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

It is a cyclic number.

It is not a de Polignac number, because 216707243 - 2¹⁶ = 216641707 is a prime.

It is a super-2 number, since 2×216707243² = 93924058337322098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216707203) 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, 38288 + ... + 43581.

It is an arithmetic number, because the mean of its divisors is an integer number (54197940).

Almost surely, 2^216707243 is an apocalyptic number.

216707243 is a deficient number, since it is larger than the sum of its proper divisors (84517).

216707243 is an equidigital number, since it uses as much as digits as its factorization.

216707243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84516.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 216707243 is about 14720.9796888658. The cubic root of 216707243 is about 600.6541412026.

The spelling of 216707243 in words is "two hundred sixteen million, seven hundred seven thousand, two hundred forty-three".