216215215 has 4 divisors (see below), whose sum is σ = 259458264. Its totient is φ = 172972168.

The previous prime is 216215201. The next prime is 216215243. The reversal of 216215215 is 512512612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216215215 - 2²³ = 207826607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216215215.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 21621517 + ... + 21621526.

It is an arithmetic number, because the mean of its divisors is an integer number (64864566).

Almost surely, 2^216215215 is an apocalyptic number.

216215215 is a deficient number, since it is larger than the sum of its proper divisors (43243049).

216215215 is an equidigital number, since it uses as much as digits as its factorization.

216215215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43243048.

The product of its digits is 1200, while the sum is 25.

The square root of 216215215 is about 14704.2583968046. The cubic root of 216215215 is about 600.1992070018.

Adding to 216215215 its reverse (512512612), we get a palindrome (728727827).

The spelling of 216215215 in words is "two hundred sixteen million, two hundred fifteen thousand, two hundred fifteen".