100221220221 has 4 divisors (see below), whose sum is σ = 133628293632. Its totient is φ = 66814146812.

The previous prime is 100221220201. The next prime is 100221220237. The reversal of 100221220221 is 122022122001.

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 a cyclic number.

It is not a de Polignac number, because 100221220221 - 2¹¹ = 100221218173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100221220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221220201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16703536701 + ... + 16703536706.

It is an arithmetic number, because the mean of its divisors is an integer number (33407073408).

Almost surely, 2^100221220221 is an apocalyptic number.

It is an amenable number.

100221220221 is a deficient number, since it is larger than the sum of its proper divisors (33407073411).

100221220221 is an equidigital number, since it uses as much as digits as its factorization.

100221220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33407073410.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 100221220221 its reverse (122022122001), we get a palindrome (222243342222).

The spelling of 100221220221 in words is "one hundred billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-one".