221689616 has 40 divisors (see below), whose sum is σ = 439161624. Its totient is φ = 108380160.

The previous prime is 221689579. The next prime is 221689631. The reversal of 221689616 is 616986122.

It is a happy number.

221689616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 63936016 + 157753600 = 7996^2 + 12560^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191696 + ... + 192848.

Almost surely, 2^221689616 is an apocalyptic number.

It is an amenable number.

221689616 is a deficient number, since it is larger than the sum of its proper divisors (217472008).

221689616 is a wasteful number, since it uses less digits than its factorization.

221689616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1413 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 221689616 is about 14889.2449774997. The cubic root of 221689616 is about 605.2225722985. Note that the first 3 decimals are identical.

The spelling of 221689616 in words is "two hundred twenty-one million, six hundred eighty-nine thousand, six hundred sixteen".