11211121100221 has 4 divisors (see below), whose sum is σ = 12812709828832. Its totient is φ = 9609532371612.

The previous prime is 11211121100213. The next prime is 11211121100261. The reversal of 11211121100221 is 12200112111211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11211121100221 - 2³ = 11211121100213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211121100195 and 11211121100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211121100261) 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, 800794364295 + ... + 800794364308.

It is an arithmetic number, because the mean of its divisors is an integer number (3203177457208).

Almost surely, 2^{11211121100221} is an apocalyptic number.

It is an amenable number.

11211121100221 is a deficient number, since it is larger than the sum of its proper divisors (1601588728611).

11211121100221 is an equidigital number, since it uses as much as digits as its factorization.

11211121100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601588728610.

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

Adding to 11211121100221 its reverse (12200112111211), we get a palindrome (23411233211432).

The spelling of 11211121100221 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-one".