216912207 has 4 divisors (see below), whose sum is σ = 289216280. Its totient is φ = 144608136.

The previous prime is 216912173. The next prime is 216912209. The reversal of 216912207 is 702219612.

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

It is not a de Polignac number, because 216912207 - 2²⁰ = 215863631 is a prime.

It is a super-2 number, since 2×216912207² = 94101811091221698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216912209) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36152032 + ... + 36152037.

It is an arithmetic number, because the mean of its divisors is an integer number (72304070).

Almost surely, 2^216912207 is an apocalyptic number.

216912207 is a deficient number, since it is larger than the sum of its proper divisors (72304073).

216912207 is an equidigital number, since it uses as much as digits as its factorization.

216912207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72304072.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 216912207 is about 14727.9396726087. The cubic root of 216912207 is about 600.8434498760.

The spelling of 216912207 in words is "two hundred sixteen million, nine hundred twelve thousand, two hundred seven".