216223771 has 2 divisors, whose sum is σ = 216223772. Its totient is φ = 216223770.

The previous prime is 216223769. The next prime is 216223783. The reversal of 216223771 is 177322612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216223771 - 2¹ = 216223769 is a prime.

Together with 216223769, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216223571) 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 as a sum of consecutive naturals, namely, 108111885 + 108111886.

It is an arithmetic number, because the mean of its divisors is an integer number (108111886).

Almost surely, 2^216223771 is an apocalyptic number.

216223771 is a deficient number, since it is larger than the sum of its proper divisors (1).

216223771 is an equidigital number, since it uses as much as digits as its factorization.

216223771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 216223771 is about 14704.5493300543. The cubic root of 216223771 is about 600.2071238617.

The spelling of 216223771 in words is "two hundred sixteen million, two hundred twenty-three thousand, seven hundred seventy-one".