216866422 has 8 divisors (see below), whose sum is σ = 326003616. Its totient is φ = 108198552.

The previous prime is 216866401. The next prime is 216866491. The reversal of 216866422 is 224668612.

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

It is a congruent number.

It is an unprimeable number.

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, 116173 + ... + 118024.

It is an arithmetic number, because the mean of its divisors is an integer number (40750452).

Almost surely, 2^216866422 is an apocalyptic number.

216866422 is a deficient number, since it is larger than the sum of its proper divisors (109137194).

216866422 is a wasteful number, since it uses less digits than its factorization.

216866422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234662.

The product of its digits is 55296, while the sum is 37.

The square root of 216866422 is about 14726.3852319570. The cubic root of 216866422 is about 600.8011723213.

The spelling of 216866422 in words is "two hundred sixteen million, eight hundred sixty-six thousand, four hundred twenty-two".