221441684 has 6 divisors (see below), whose sum is σ = 387522954. Its totient is φ = 110720840.

The previous prime is 221441681. The next prime is 221441699. The reversal of 221441684 is 486144122.

It can be written as a sum of positive squares in only one way, i.e., 185776900 + 35664784 = 13630^2 + 5972^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221441684.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221441681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27680207 + ... + 27680214.

It is an arithmetic number, because the mean of its divisors is an integer number (64587159).

Almost surely, 2^221441684 is an apocalyptic number.

It is an amenable number.

221441684 is a deficient number, since it is larger than the sum of its proper divisors (166081270).

221441684 is a wasteful number, since it uses less digits than its factorization.

221441684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55360425 (or 55360423 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 221441684 is about 14880.9167728336. The cubic root of 221441684 is about 604.9968663180.

The spelling of 221441684 in words is "two hundred twenty-one million, four hundred forty-one thousand, six hundred eighty-four".