221096215 has 4 divisors (see below), whose sum is σ = 265315464. Its totient is φ = 176876968.

The previous prime is 221096209. The next prime is 221096219. The reversal of 221096215 is 512690122.

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 221096215 - 2³ = 221096207 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 (221096219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22109617 + ... + 22109626.

It is an arithmetic number, because the mean of its divisors is an integer number (66328866).

Almost surely, 2^221096215 is an apocalyptic number.

221096215 is a deficient number, since it is larger than the sum of its proper divisors (44219249).

221096215 is an equidigital number, since it uses as much as digits as its factorization.

221096215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44219248.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 221096215 is about 14869.3044558244. The cubic root of 221096215 is about 604.6820860063.

The spelling of 221096215 in words is "two hundred twenty-one million, ninety-six thousand, two hundred fifteen".