216215249 has 16 divisors (see below), whose sum is σ = 232751232. Its totient is φ = 200373888.

The previous prime is 216215243. The next prime is 216215257. The reversal of 216215249 is 942512612.

It is a cyclic number.

It is not a de Polignac number, because 216215249 - 2²⁰ = 215166673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216215243) 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, 100109 + ... + 102245.

It is an arithmetic number, because the mean of its divisors is an integer number (14546952).

Almost surely, 2^216215249 is an apocalyptic number.

It is an amenable number.

216215249 is a deficient number, since it is larger than the sum of its proper divisors (16535983).

216215249 is a wasteful number, since it uses less digits than its factorization.

216215249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296.

The product of its digits is 8640, while the sum is 32.

The square root of 216215249 is about 14704.2595529323. The cubic root of 216215249 is about 600.1992384624.

The spelling of 216215249 in words is "two hundred sixteen million, two hundred fifteen thousand, two hundred forty-nine".