221066445 has 16 divisors (see below), whose sum is σ = 360381312. Its totient is φ = 115677120.

The previous prime is 221066441. The next prime is 221066459. The reversal of 221066445 is 544660122.

It is not a de Polignac number, because 221066445 - 2² = 221066441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221066441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138241 + ... + 139830.

It is an arithmetic number, because the mean of its divisors is an integer number (22523832).

Almost surely, 2^221066445 is an apocalyptic number.

It is an amenable number.

221066445 is a deficient number, since it is larger than the sum of its proper divisors (139314867).

221066445 is a wasteful number, since it uses less digits than its factorization.

221066445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278132.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 221066445 is about 14868.3033665580. The cubic root of 221066445 is about 604.6549451923.

The spelling of 221066445 in words is "two hundred twenty-one million, sixty-six thousand, four hundred forty-five".