221200664 has 16 divisors (see below), whose sum is σ = 418423320. Its totient is φ = 109621120.

The previous prime is 221200657. The next prime is 221200673. The reversal of 221200664 is 466002122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121442 + ... + 123249.

Almost surely, 2^221200664 is an apocalyptic number.

It is an amenable number.

221200664 is a deficient number, since it is larger than the sum of its proper divisors (197222656).

221200664 is a wasteful number, since it uses less digits than its factorization.

221200664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244810 (or 244806 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 221200664 is about 14872.8162766841. The cubic root of 221200664 is about 604.7772911581. Note that the first 3 decimals are identical.

Adding to 221200664 its reverse (466002122), we get a palindrome (687202786).

The spelling of 221200664 in words is "two hundred twenty-one million, two hundred thousand, six hundred sixty-four".