10000221 has 16 divisors (see below), whose sum is σ = 16624128. Its totient is φ = 5194800.

The previous prime is 10000189. The next prime is 10000223. The reversal of 10000221 is 12200001.

It is a happy number.

It is not a de Polignac number, because 10000221 - 2⁵ = 10000189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000223) 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, 21415 + ... + 21876.

It is an arithmetic number, because the mean of its divisors is an integer number (1039008).

Almost surely, 2^10000221 is an apocalyptic number.

10000221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10000221 is a deficient number, since it is larger than the sum of its proper divisors (6623907).

10000221 is a wasteful number, since it uses less digits than its factorization.

10000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43312.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 10000221 is about 3162.3126031435. The cubic root of 10000221 is about 215.4450560917.

Adding to 10000221 its reverse (12200001), we get a palindrome (22200222).

The spelling of 10000221 in words is "ten million, two hundred twenty-one", and thus it is an aban number.