221684116 has 6 divisors (see below), whose sum is σ = 387947210. Its totient is φ = 110842056.

The previous prime is 221684083. The next prime is 221684117. The reversal of 221684116 is 611486122.

It can be written as a sum of positive squares in only one way, i.e., 194602500 + 27081616 = 13950^2 + 5204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221684117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710511 + ... + 27710518.

Almost surely, 2^221684116 is an apocalyptic number.

It is an amenable number.

221684116 is a deficient number, since it is larger than the sum of its proper divisors (166263094).

221684116 is a wasteful number, since it uses less digits than its factorization.

221684116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55421033 (or 55421031 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 221684116 is about 14889.0602792789. The cubic root of 221684116 is about 605.2175671751.

The spelling of 221684116 in words is "two hundred twenty-one million, six hundred eighty-four thousand, one hundred sixteen".