216999195 has 24 divisors (see below), whose sum is σ = 403885584. Its totient is φ = 99199296.

The previous prime is 216999193. The next prime is 216999239. The reversal of 216999195 is 591999612.

It is a happy number.

It is not a de Polignac number, because 216999195 - 2¹ = 216999193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216999193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146884 + ... + 148353.

It is an arithmetic number, because the mean of its divisors is an integer number (16828566).

Almost surely, 2^216999195 is an apocalyptic number.

216999195 is a deficient number, since it is larger than the sum of its proper divisors (186886389).

216999195 is a wasteful number, since it uses less digits than its factorization.

216999195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295259 (or 295252 counting only the distinct ones).

The product of its digits is 393660, while the sum is 51.

The square root of 216999195 is about 14730.8925391505. The cubic root of 216999195 is about 600.9237576121.

The spelling of 216999195 in words is "two hundred sixteen million, nine hundred ninety-nine thousand, one hundred ninety-five".