100221321 has 4 divisors (see below), whose sum is σ = 133628432. Its totient is φ = 66814212.

The previous prime is 100221311. The next prime is 100221323. The reversal of 100221321 is 123122001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 100221321 - 2⁷ = 100221193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100221297 and 100221306.

It is not an unprimeable number, because it can be changed into a prime (100221323) 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 3 ways as a sum of consecutive naturals, for example, 16703551 + ... + 16703556.

It is an arithmetic number, because the mean of its divisors is an integer number (33407108).

Almost surely, 2^100221321 is an apocalyptic number.

It is an amenable number.

100221321 is a deficient number, since it is larger than the sum of its proper divisors (33407111).

100221321 is an equidigital number, since it uses as much as digits as its factorization.

100221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33407110.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 100221321 is about 10011.0599338931. The cubic root of 100221321 is about 464.5010580779.

Adding to 100221321 its reverse (123122001), we get a palindrome (223343322).

The spelling of 100221321 in words is "one hundred million, two hundred twenty-one thousand, three hundred twenty-one".