221120215 has 16 divisors (see below), whose sum is σ = 275114880. Its totient is φ = 170410240.

The previous prime is 221120197. The next prime is 221120219. The reversal of 221120215 is 512021122.

It is a happy number.

It is not a de Polignac number, because 221120215 - 2⁷ = 221120087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74082 + ... + 77008.

It is an arithmetic number, because the mean of its divisors is an integer number (17194680).

Almost surely, 2^221120215 is an apocalyptic number.

221120215 is a deficient number, since it is larger than the sum of its proper divisors (53994665).

221120215 is a wasteful number, since it uses less digits than its factorization.

221120215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3482.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221120215 is about 14870.1114656212. Note that the first 3 decimals coincide. The cubic root of 221120215 is about 604.7039646335.

Adding to 221120215 its reverse (512021122), we get a palindrome (733141337).

The spelling of 221120215 in words is "two hundred twenty-one million, one hundred twenty thousand, two hundred fifteen".