100326221 has 4 divisors (see below), whose sum is σ = 102773244. Its totient is φ = 97879200.

The previous prime is 100326217. The next prime is 100326241. The reversal of 100326221 is 122623001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21808900 + 78517321 = 4670^2 + 8861^2 .

It is a cyclic number.

It is not a de Polignac number, because 100326221 - 2² = 100326217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100326221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100326211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223450 + ... + 1223531.

It is an arithmetic number, because the mean of its divisors is an integer number (25693311).

Almost surely, 2^100326221 is an apocalyptic number.

It is an amenable number.

100326221 is a deficient number, since it is larger than the sum of its proper divisors (2447023).

100326221 is an equidigital number, since it uses as much as digits as its factorization.

100326221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447022.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 100326221 is about 10016.2977691361. The cubic root of 100326221 is about 464.6630634280.

Adding to 100326221 its reverse (122623001), we get a palindrome (222949222).

The spelling of 100326221 in words is "one hundred million, three hundred twenty-six thousand, two hundred twenty-one".