216810923 has 8 divisors (see below), whose sum is σ = 249268992. Its totient is φ = 184724136.

The previous prime is 216810907. The next prime is 216810929. The reversal of 216810923 is 329018612.

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 216810923 - 2⁴ = 216810907 is a prime.

It is a super-2 number, since 2×216810923² = 94013952664223858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216810923.

It is not an unprimeable number, because it can be changed into a prime (216810929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91565 + ... + 93902.

It is an arithmetic number, because the mean of its divisors is an integer number (31158624).

Almost surely, 2^216810923 is an apocalyptic number.

216810923 is a deficient number, since it is larger than the sum of its proper divisors (32458069).

216810923 is a wasteful number, since it uses less digits than its factorization.

216810923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185641.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 216810923 is about 14724.5007725220. The cubic root of 216810923 is about 600.7499169468.

The spelling of 216810923 in words is "two hundred sixteen million, eight hundred ten thousand, nine hundred twenty-three".