100221221021 has 4 divisors (see below), whose sum is σ = 100440523932. Its totient is φ = 100001918112.

The previous prime is 100221220999. The next prime is 100221221027. The reversal of 100221221021 is 120122122001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120122122001 = 7 ⋅17160303143.

It can be written as a sum of positive squares in 2 ways, for example, as 92239764100 + 7981456921 = 303710^2 + 89339^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221221021 - 2¹⁰ = 100221219997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100221220987 and 100221221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221221027) 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, 109650770 + ... + 109651683.

It is an arithmetic number, because the mean of its divisors is an integer number (25110130983).

Almost surely, 2^100221221021 is an apocalyptic number.

It is an amenable number.

100221221021 is a deficient number, since it is larger than the sum of its proper divisors (219302911).

100221221021 is an equidigital number, since it uses as much as digits as its factorization.

100221221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219302910.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 100221221021 its reverse (120122122001), we get a palindrome (220343343022).

The spelling of 100221221021 in words is "one hundred billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty-one".