221450215 has 32 divisors (see below), whose sum is σ = 312491520. Its totient is φ = 147498624.

The previous prime is 221450189. The next prime is 221450221. The reversal of 221450215 is 512054122.

It is not a de Polignac number, because 221450215 - 2¹⁵ = 221417447 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 404572 + ... + 405118.

It is an arithmetic number, because the mean of its divisors is an integer number (9765360).

Almost surely, 2^221450215 is an apocalyptic number.

221450215 is a deficient number, since it is larger than the sum of its proper divisors (91041305).

221450215 is a wasteful number, since it uses less digits than its factorization.

221450215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 221450215 is about 14881.2034123588. The cubic root of 221450215 is about 605.0046353491.

The spelling of 221450215 in words is "two hundred twenty-one million, four hundred fifty thousand, two hundred fifteen".