216722189 has 8 divisors (see below), whose sum is σ = 229021440. Its totient is φ = 204512256.

The previous prime is 216722183. The next prime is 216722237. The reversal of 216722189 is 981227612.

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-216722189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216722183) 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, 17309 + ... + 27074.

It is an arithmetic number, because the mean of its divisors is an integer number (28627680).

Almost surely, 2^216722189 is an apocalyptic number.

It is an amenable number.

216722189 is a deficient number, since it is larger than the sum of its proper divisors (12299251).

216722189 is a wasteful number, since it uses less digits than its factorization.

216722189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44659.

The product of its digits is 24192, while the sum is 38.

The square root of 216722189 is about 14721.4873229576. The cubic root of 216722189 is about 600.6679496480.

The spelling of 216722189 in words is "two hundred sixteen million, seven hundred twenty-two thousand, one hundred eighty-nine".