216821882 has 8 divisors (see below), whose sum is σ = 342350400. Its totient is φ = 102705084.

The previous prime is 216821809. The next prime is 216821921. The reversal of 216821882 is 288128612.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 5705839 = 216821882 / (2 + 1 + 6 + 8 + 2 + 1 + 8 + 8 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2852882 + ... + 2852957.

It is an arithmetic number, because the mean of its divisors is an integer number (42793800).

Almost surely, 2^216821882 is an apocalyptic number.

216821882 is a deficient number, since it is larger than the sum of its proper divisors (125528518).

216821882 is a wasteful number, since it uses less digits than its factorization.

216821882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5705860.

The product of its digits is 24576, while the sum is 38.

The square root of 216821882 is about 14724.8729026773. The cubic root of 216821882 is about 600.7600386807.

The spelling of 216821882 in words is "two hundred sixteen million, eight hundred twenty-one thousand, eight hundred eighty-two".