216214685 has 8 divisors (see below), whose sum is σ = 263012280. Its totient is φ = 170601984.

The previous prime is 216214679. The next prime is 216214709. The reversal of 216214685 is 586412612.

It can be written as a sum of positive squares in 4 ways, for example, as 16924996 + 199289689 = 4114^2 + 14117^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216214685 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295820 + ... + 296549.

It is an arithmetic number, because the mean of its divisors is an integer number (32876535).

Almost surely, 2^216214685 is an apocalyptic number.

It is an amenable number.

216214685 is a deficient number, since it is larger than the sum of its proper divisors (46797595).

216214685 is an equidigital number, since it uses as much as digits as its factorization.

216214685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592447.

The product of its digits is 23040, while the sum is 35.

The square root of 216214685 is about 14704.2403748035. The cubic root of 216214685 is about 600.1987165863.

The spelling of 216214685 in words is "two hundred sixteen million, two hundred fourteen thousand, six hundred eighty-five".