100111211210221 has 4 divisors (see below), whose sum is σ = 100183703037244. Its totient is φ = 100038719383200.

The previous prime is 100111211210191. The next prime is 100111211210233. The reversal of 100111211210221 is 122012112111001.

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 61312501852900 + 38798709357321 = 7830230^2 + 6228861^2 .

It is a cyclic number.

It is not a de Polignac number, because 100111211210221 - 2¹³ = 100111211202029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100111211210195 and 100111211210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100111211219221) 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, 36245911440 + ... + 36245914201.

It is an arithmetic number, because the mean of its divisors is an integer number (25045925759311).

Almost surely, 2^{100111211210221} is an apocalyptic number.

It is an amenable number.

100111211210221 is a deficient number, since it is larger than the sum of its proper divisors (72491827023).

100111211210221 is an equidigital number, since it uses as much as digits as its factorization.

100111211210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72491827022.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 100111211210221 its reverse (122012112111001), we get a palindrome (222123323321222).

The spelling of 100111211210221 in words is "one hundred trillion, one hundred eleven billion, two hundred eleven million, two hundred ten thousand, two hundred twenty-one".