216552217 has 12 divisors (see below), whose sum is σ = 252295680. Its totient is φ = 185330376.

The previous prime is 216552211. The next prime is 216552221. The reversal of 216552217 is 712255612.

It is a de Polignac number, because none of the positive numbers 2^k-216552217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216552211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32584 + ... + 38662.

It is an arithmetic number, because the mean of its divisors is an integer number (21024640).

Almost surely, 2^216552217 is an apocalyptic number.

It is an amenable number.

216552217 is a deficient number, since it is larger than the sum of its proper divisors (35743463).

216552217 is an equidigital number, since it uses as much as digits as its factorization.

216552217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6820 (or 6813 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 216552217 is about 14715.7132684760. The cubic root of 216552217 is about 600.5108769215.

The spelling of 216552217 in words is "two hundred sixteen million, five hundred fifty-two thousand, two hundred seventeen".