216905011 has 2 divisors, whose sum is σ = 216905012. Its totient is φ = 216905010.

The previous prime is 216904999. The next prime is 216905027. The reversal of 216905011 is 110509612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216905011 - 2¹¹ = 216902963 is a prime.

It is not a weakly prime, because it can be changed into another prime (216905041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108452505 + 108452506.

It is an arithmetic number, because the mean of its divisors is an integer number (108452506).

Almost surely, 2^216905011 is an apocalyptic number.

216905011 is a deficient number, since it is larger than the sum of its proper divisors (1).

216905011 is an equidigital number, since it uses as much as digits as its factorization.

216905011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 216905011 is about 14727.6953730039. The cubic root of 216905011 is about 600.8368055331.

The spelling of 216905011 in words is "two hundred sixteen million, nine hundred five thousand, eleven".