211500215 has 8 divisors (see below), whose sum is σ = 254618208. Its totient is φ = 168654880.

The previous prime is 211500193. The next prime is 211500217. The reversal of 211500215 is 512005112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-211500215 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211500193 and 211500202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211500217) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 66452 + ... + 69561.

It is an arithmetic number, because the mean of its divisors is an integer number (31827276).

Almost surely, 2^211500215 is an apocalyptic number.

211500215 is a deficient number, since it is larger than the sum of its proper divisors (43117993).

211500215 is a wasteful number, since it uses less digits than its factorization.

211500215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136329.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 211500215 is about 14543.0469640994. The cubic root of 211500215 is about 595.8042604144.

Adding to 211500215 its reverse (512005112), we get a palindrome (723505327).

The spelling of 211500215 in words is "two hundred eleven million, five hundred thousand, two hundred fifteen".