216787011 has 16 divisors (see below), whose sum is σ = 331186944. Its totient is φ = 123561504.

The previous prime is 216787007. The next prime is 216787031. The reversal of 216787011 is 110787612.

It is not a de Polignac number, because 216787011 - 2² = 216787007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216787031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4665 + ... + 21338.

It is an arithmetic number, because the mean of its divisors is an integer number (20699184).

Almost surely, 2^216787011 is an apocalyptic number.

216787011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

216787011 is a deficient number, since it is larger than the sum of its proper divisors (114399933).

216787011 is a wasteful number, since it uses less digits than its factorization.

216787011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26410.

The product of its (nonzero) digits is 4704, while the sum is 33.

The square root of 216787011 is about 14723.6887701418. The cubic root of 216787011 is about 600.7278306362.

The spelling of 216787011 in words is "two hundred sixteen million, seven hundred eighty-seven thousand, eleven".