100001201221 has 4 divisors (see below), whose sum is σ = 100028166700. Its totient is φ = 99974235744.

The previous prime is 100001201189. The next prime is 100001201257. The reversal of 100001201221 is 122102100001.

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 13940524900 + 86060676321 = 118070^2 + 293361^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001201221 - 2⁵ = 100001201189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100001201198 and 100001201207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001202221) 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, 13477176 + ... + 13484593.

It is an arithmetic number, because the mean of its divisors is an integer number (25007041675).

Almost surely, 2^100001201221 is an apocalyptic number.

It is an amenable number.

100001201221 is a deficient number, since it is larger than the sum of its proper divisors (26965479).

100001201221 is an equidigital number, since it uses as much as digits as its factorization.

100001201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26965478.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100001201221 its reverse (122102100001), we get a palindrome (222103301222).

The spelling of 100001201221 in words is "one hundred billion, one million, two hundred one thousand, two hundred twenty-one".