212215 has 4 divisors (see below), whose sum is σ = 254664. Its totient is φ = 169768.

The previous prime is 212209. The next prime is 212227. The reversal of 212215 is 512212.

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 212215 - 2³ = 212207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212195 and 212204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21217 + ... + 21226.

It is an arithmetic number, because the mean of its divisors is an integer number (63666).

2²¹²²¹⁵ is an apocalyptic number.

212215 is a deficient number, since it is larger than the sum of its proper divisors (42449).

212215 is an equidigital number, since it uses as much as digits as its factorization.

212215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42448.

The product of its digits is 40, while the sum is 13.

The square root of 212215 is about 460.6679932446. The cubic root of 212215 is about 59.6474698013.

Adding to 212215 its reverse (512212), we get a palindrome (724427).

The spelling of 212215 in words is "two hundred twelve thousand, two hundred fifteen".