100221 has 8 divisors (see below), whose sum is σ = 145824. Its totient is φ = 60720.

The previous prime is 100213. The next prime is 100237. The reversal of 100221 is 122001.

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 100221 - 2³ = 100213 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 (100271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1486 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (18228).

2¹⁰⁰²²¹ is an apocalyptic number.

100221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100221 is a deficient number, since it is larger than the sum of its proper divisors (45603).

100221 is a wasteful number, since it uses less digits than its factorization.

100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3051.

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

The square root of 100221 is about 316.5770048503. The cubic root of 100221 is about 46.4500562159.

Adding to 100221 its reverse (122001), we get a palindrome (222222).

The spelling of 100221 in words is "one hundred thousand, two hundred twenty-one", and thus it is an iban number.