216644227 has 2 divisors, whose sum is σ = 216644228. Its totient is φ = 216644226.

The previous prime is 216644221. The next prime is 216644269. The reversal of 216644227 is 722446612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216644227 - 2¹⁵ = 216611459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216644192 and 216644201.

It is not a weakly prime, because it can be changed into another prime (216644221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108322113 + 108322114.

It is an arithmetic number, because the mean of its divisors is an integer number (108322114).

Almost surely, 2^216644227 is an apocalyptic number.

216644227 is a deficient number, since it is larger than the sum of its proper divisors (1).

216644227 is an equidigital number, since it uses as much as digits as its factorization.

216644227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 34.

The square root of 216644227 is about 14718.8391865663. The cubic root of 216644227 is about 600.5959144289.

The spelling of 216644227 in words is "two hundred sixteen million, six hundred forty-four thousand, two hundred twenty-seven".