221315215 has 8 divisors (see below), whose sum is σ = 289721808. Its totient is φ = 160956480.

The previous prime is 221315203. The next prime is 221315219. The reversal of 221315215 is 512513122.

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

It is not a de Polignac number, because 221315215 - 2⁵ = 221315183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221315219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2011902 + ... + 2012011.

It is an arithmetic number, because the mean of its divisors is an integer number (36215226).

Almost surely, 2^221315215 is an apocalyptic number.

221315215 is a deficient number, since it is larger than the sum of its proper divisors (68406593).

221315215 is a wasteful number, since it uses less digits than its factorization.

221315215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023929.

The product of its digits is 600, while the sum is 22.

The square root of 221315215 is about 14876.6667973710. Note that the first 3 decimals coincide. The cubic root of 221315215 is about 604.8816698203.

Adding to 221315215 its reverse (512513122), we get a palindrome (733828337).

The spelling of 221315215 in words is "two hundred twenty-one million, three hundred fifteen thousand, two hundred fifteen".