221063345 has 16 divisors (see below), whose sum is σ = 276194640. Its totient is φ = 169703424.

The previous prime is 221063341. The next prime is 221063357. The reversal of 221063345 is 543360122.

It can be written as a sum of positive squares in 8 ways, for example, as 1993744 + 219069601 = 1412^2 + 14801^2 .

It is a cyclic number.

It is not a de Polignac number, because 221063345 - 2² = 221063341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221063341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5321 + ... + 21689.

It is an arithmetic number, because the mean of its divisors is an integer number (17262165).

Almost surely, 2^221063345 is an apocalyptic number.

It is an amenable number.

221063345 is a deficient number, since it is larger than the sum of its proper divisors (55131295).

221063345 is a wasteful number, since it uses less digits than its factorization.

221063345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16484.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 221063345 is about 14868.1991175798. The cubic root of 221063345 is about 604.6521188338.

The spelling of 221063345 in words is "two hundred twenty-one million, sixty-three thousand, three hundred forty-five".