221116655 has 16 divisors (see below), whose sum is σ = 269827200. Its totient is φ = 173921280.

The previous prime is 221116639. The next prime is 221116667. The reversal of 221116655 is 556611122.

It is a happy number.

It is not a de Polignac number, because 221116655 - 2⁴ = 221116639 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105215 + ... + 107295.

It is an arithmetic number, because the mean of its divisors is an integer number (16864200).

Almost surely, 2^221116655 is an apocalyptic number.

221116655 is a deficient number, since it is larger than the sum of its proper divisors (48710545).

221116655 is a wasteful number, since it uses less digits than its factorization.

221116655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434.

The product of its digits is 3600, while the sum is 29.

The square root of 221116655 is about 14869.9917619345. The cubic root of 221116655 is about 604.7007194038.

Adding to 221116655 its reverse (556611122), we get a palindrome (777727777).

The spelling of 221116655 in words is "two hundred twenty-one million, one hundred sixteen thousand, six hundred fifty-five".