100100000221 has 4 divisors (see below), whose sum is σ = 107800000252. Its totient is φ = 92400000192.

The previous prime is 100100000213. The next prime is 100100000237. The reversal of 100100000221 is 122000001001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122000001001 = 3769 ⋅32369329.

It can be written as a sum of positive squares in 2 ways, for example, as 9866448900 + 90233551321 = 99330^2 + 300389^2 .

It is a cyclic number.

It is not a de Polignac number, because 100100000221 - 2³ = 100100000213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100100000921) 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, 3849999996 + ... + 3850000021.

It is an arithmetic number, because the mean of its divisors is an integer number (26950000063).

Almost surely, 2^100100000221 is an apocalyptic number.

It is an amenable number.

100100000221 is a deficient number, since it is larger than the sum of its proper divisors (7700000031).

100100000221 is an equidigital number, since it uses as much as digits as its factorization.

100100000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7700000030.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 100100000221 its reverse (122000001001), we get a palindrome (222100001222).

The spelling of 100100000221 in words is "one hundred billion, one hundred million, two hundred twenty-one", and thus it is an aban number.