221066706 has 16 divisors (see below), whose sum is σ = 505295424. Its totient is φ = 63161904.

The previous prime is 221066693. The next prime is 221066717. The reversal of 221066706 is 607660122.

It is a Curzon number.

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, 2631705 + ... + 2631788.

It is an arithmetic number, because the mean of its divisors is an integer number (31580964).

Almost surely, 2^221066706 is an apocalyptic number.

221066706 is an abundant number, since it is smaller than the sum of its proper divisors (284228718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221066706 is a wasteful number, since it uses less digits than its factorization.

221066706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263505.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 221066706 is about 14868.3121436160. The cubic root of 221066706 is about 604.6551831523.

The spelling of 221066706 in words is "two hundred twenty-one million, sixty-six thousand, seven hundred six".