221215 has 8 divisors (see below), whose sum is σ = 268128. Its totient is φ = 175200.

The previous prime is 221209. The next prime is 221219. The reversal of 221215 is 512122.

221215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221215 - 2⁷ = 221087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221195 and 221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609 + ... + 901.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2²²¹²¹⁵ is an apocalyptic number.

221215 is a deficient number, since it is larger than the sum of its proper divisors (46913).

221215 is a wasteful number, since it uses less digits than its factorization.

221215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449.

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

The square root of 221215 is about 470.3349870039. The cubic root of 221215 is about 60.4790356068.

Adding to 221215 its reverse (512122), we get a palindrome (733337).

The spelling of 221215 in words is "two hundred twenty-one thousand, two hundred fifteen".