221066355 has 16 divisors (see below), whose sum is σ = 353963520. Its totient is φ = 117816288.

The previous prime is 221066327. The next prime is 221066359. The reversal of 221066355 is 553660122.

It is not a de Polignac number, because 221066355 - 2⁵ = 221066323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221066359) 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, 19734 + ... + 28836.

It is an arithmetic number, because the mean of its divisors is an integer number (22122720).

Almost surely, 2^221066355 is an apocalyptic number.

221066355 is a deficient number, since it is larger than the sum of its proper divisors (132897165).

221066355 is a wasteful number, since it uses less digits than its factorization.

221066355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10730.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 221066355 is about 14868.3003399851. The cubic root of 221066355 is about 604.6548631371.

The spelling of 221066355 in words is "two hundred twenty-one million, sixty-six thousand, three hundred fifty-five".