216220447 has 4 divisors (see below), whose sum is σ = 225621360. Its totient is φ = 206819536.

The previous prime is 216220439. The next prime is 216220463. The reversal of 216220447 is 744022612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216220447 - 2³ = 216220439 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 (216220547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4700422 + ... + 4700467.

It is an arithmetic number, because the mean of its divisors is an integer number (56405340).

Almost surely, 2^216220447 is an apocalyptic number.

216220447 is a deficient number, since it is larger than the sum of its proper divisors (9400913).

216220447 is an equidigital number, since it uses as much as digits as its factorization.

216220447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9400912.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 216220447 is about 14704.4363033746. The cubic root of 216220447 is about 600.2040481920.

The spelling of 216220447 in words is "two hundred sixteen million, two hundred twenty thousand, four hundred forty-seven".