216941771 has 2 divisors, whose sum is σ = 216941772. Its totient is φ = 216941770.

The previous prime is 216941749. The next prime is 216941797. The reversal of 216941771 is 177149612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216941771 - 2²² = 212747467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (216941731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108470885 + 108470886.

It is an arithmetic number, because the mean of its divisors is an integer number (108470886).

Almost surely, 2^216941771 is an apocalyptic number.

216941771 is a deficient number, since it is larger than the sum of its proper divisors (1).

216941771 is an equidigital number, since it uses as much as digits as its factorization.

216941771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 216941771 is about 14728.9433090090. The cubic root of 216941771 is about 600.8707459098.

It can be divided in two parts, 216941 and 771, that added together give a palindrome (217712).

The spelling of 216941771 in words is "two hundred sixteen million, nine hundred forty-one thousand, seven hundred seventy-one".