221073566 has 16 divisors (see below), whose sum is σ = 380574720. Its totient is φ = 94347960.

The previous prime is 221073563. The next prime is 221073613. The reversal of 221073566 is 665370122.

221073566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221073563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29690 + ... + 36381.

It is an arithmetic number, because the mean of its divisors is an integer number (23785920).

Almost surely, 2^221073566 is an apocalyptic number.

221073566 is a deficient number, since it is larger than the sum of its proper divisors (159501154).

221073566 is a wasteful number, since it uses less digits than its factorization.

221073566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66319.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 221073566 is about 14868.5428337817. The cubic root of 221073566 is about 604.6614375113.

The spelling of 221073566 in words is "two hundred twenty-one million, seventy-three thousand, five hundred sixty-six".