221100004 has 6 divisors (see below), whose sum is σ = 386925014. Its totient is φ = 110550000.

The previous prime is 221099999. The next prime is 221100037. The reversal of 221100004 is 400001122.

It can be written as a sum of positive squares in only one way, i.e., 214329600 + 6770404 = 14640^2 + 2602^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 27637497 + ... + 27637504.

Almost surely, 2^221100004 is an apocalyptic number.

It is an amenable number.

221100004 is a deficient number, since it is larger than the sum of its proper divisors (165825010).

221100004 is a wasteful number, since it uses less digits than its factorization.

221100004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55275005 (or 55275003 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 221100004 is about 14869.4318654076. The cubic root of 221100004 is about 604.6855401998.

Adding to 221100004 its reverse (400001122), we get a palindrome (621101126).

The spelling of 221100004 in words is "two hundred twenty-one million, one hundred thousand, four".