221116715 has 8 divisors (see below), whose sum is σ = 265560000. Its totient is φ = 176746752.

The previous prime is 221116711. The next prime is 221116723. The reversal of 221116715 is 517611122.

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

It is a cyclic number.

It is not a de Polignac number, because 221116715 - 2² = 221116711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221116711) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11459 + ... + 23948.

It is an arithmetic number, because the mean of its divisors is an integer number (33195000).

Almost surely, 2^221116715 is an apocalyptic number.

221116715 is a deficient number, since it is larger than the sum of its proper divisors (44443285).

221116715 is a wasteful number, since it uses less digits than its factorization.

221116715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36661.

The product of its digits is 840, while the sum is 26.

The square root of 221116715 is about 14869.9937794204. The cubic root of 221116715 is about 604.7007740989.

Adding to 221116715 its reverse (517611122), we get a palindrome (738727837).

The spelling of 221116715 in words is "two hundred twenty-one million, one hundred sixteen thousand, seven hundred fifteen".