209216105 has 8 divisors (see below), whose sum is σ = 286924992. Its totient is φ = 143462448.

The previous prime is 209216101. The next prime is 209216107. The reversal of 209216105 is 501612902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209216105 - 2² = 209216101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209216101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2988767 + ... + 2988836.

It is an arithmetic number, because the mean of its divisors is an integer number (35865624).

Almost surely, 2^209216105 is an apocalyptic number.

It is an amenable number.

209216105 is a deficient number, since it is larger than the sum of its proper divisors (77708887).

209216105 is an equidigital number, since it uses as much as digits as its factorization.

209216105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5977615.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 209216105 is about 14464.3045114516. The cubic root of 209216105 is about 593.6516841091.

The spelling of 209216105 in words is "two hundred nine million, two hundred sixteen thousand, one hundred five".