221199805 has 16 divisors (see below), whose sum is σ = 280051200. Its totient is φ = 167261760.

The previous prime is 221199779. The next prime is 221199821. The reversal of 221199805 is 508991122.

It is not a de Polignac number, because 221199805 - 2⁵ = 221199773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43075 + ... + 47935.

It is an arithmetic number, because the mean of its divisors is an integer number (17503200).

Almost surely, 2^221199805 is an apocalyptic number.

It is an amenable number.

221199805 is a deficient number, since it is larger than the sum of its proper divisors (58851395).

221199805 is a wasteful number, since it uses less digits than its factorization.

221199805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5364.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 221199805 is about 14872.7873984670. The cubic root of 221199805 is about 604.7765083028.

The spelling of 221199805 in words is "two hundred twenty-one million, one hundred ninety-nine thousand, eight hundred five".