216322447 has 8 divisors (see below), whose sum is σ = 236264832. Its totient is φ = 196426200.

The previous prime is 216322427. The next prime is 216322451. The reversal of 216322447 is 744223612.

It is a happy number.

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 216322447 - 2¹¹ = 216320399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216322427) 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, 1329 + ... + 20842.

It is an arithmetic number, because the mean of its divisors is an integer number (29533104).

Almost surely, 2^216322447 is an apocalyptic number.

216322447 is a deficient number, since it is larger than the sum of its proper divisors (19942385).

216322447 is a wasteful number, since it uses less digits than its factorization.

216322447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23069.

The product of its digits is 16128, while the sum is 31.

The square root of 216322447 is about 14707.9042354783. The cubic root of 216322447 is about 600.2984135946.

The spelling of 216322447 in words is "two hundred sixteen million, three hundred twenty-two thousand, four hundred forty-seven".