100001123221 has 4 divisors (see below), whose sum is σ = 105883542252. Its totient is φ = 94118704192.

The previous prime is 100001123203. The next prime is 100001123239. The reversal of 100001123221 is 122321100001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122321100001 = 293 ⋅417478157.

It is an interprime number because it is at equal distance from previous prime (100001123203) and next prime (100001123239).

It can be written as a sum of positive squares in 2 ways, for example, as 70351727121 + 29649396100 = 265239^2 + 172190^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001123221 - 2⁹ = 100001122709 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 (100001123251) 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, 2941209490 + ... + 2941209523.

It is an arithmetic number, because the mean of its divisors is an integer number (26470885563).

Almost surely, 2^100001123221 is an apocalyptic number.

It is an amenable number.

100001123221 is a deficient number, since it is larger than the sum of its proper divisors (5882419031).

100001123221 is an equidigital number, since it uses as much as digits as its factorization.

100001123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882419030.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 100001123221 its reverse (122321100001), we get a palindrome (222322223222).

The spelling of 100001123221 in words is "one hundred billion, one million, one hundred twenty-three thousand, two hundred twenty-one".