215500215 has 32 divisors (see below), whose sum is σ = 394859520. Its totient is φ = 98313984.

The previous prime is 215500213. The next prime is 215500237. The reversal of 215500215 is 512005512.

It is not a de Polignac number, because 215500215 - 2¹ = 215500213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 215500191 and 215500200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215500213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57942 + ... + 61548.

It is an arithmetic number, because the mean of its divisors is an integer number (12339360).

Almost surely, 2^215500215 is an apocalyptic number.

215500215 is a deficient number, since it is larger than the sum of its proper divisors (179359305).

215500215 is a wasteful number, since it uses less digits than its factorization.

215500215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4191.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 215500215 is about 14679.9255788304. The cubic root of 215500215 is about 599.5368787342.

Adding to 215500215 its reverse (512005512), we get a palindrome (727505727).

The spelling of 215500215 in words is "two hundred fifteen million, five hundred thousand, two hundred fifteen".