100000221 has 8 divisors (see below), whose sum is σ = 135593760. Its totient is φ = 65536752.

The previous prime is 100000217. The next prime is 100000223. The reversal of 100000221 is 122000001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100000221 - 2² = 100000217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282310 + ... + 282663.

It is an arithmetic number, because the mean of its divisors is an integer number (16949220).

Almost surely, 2^100000221 is an apocalyptic number.

It is an amenable number.

100000221 is a deficient number, since it is larger than the sum of its proper divisors (35593539).

100000221 is an equidigital number, since it uses as much as digits as its factorization.

100000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565035.

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

The square root of 100000221 is about 10000.0110499939. The cubic root of 100000221 is about 464.1592252914.

Adding to 100000221 its reverse (122000001), we get a palindrome (222000222).

The spelling of 100000221 in words is "one hundred million, two hundred twenty-one", and thus it is an aban number.