11021100221 has 4 divisors (see below), whose sum is σ = 11669400252. Its totient is φ = 10372800192.

The previous prime is 11021100193. The next prime is 11021100241. The reversal of 11021100221 is 12200112011.

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 3344887225 + 7676212996 = 57835^2 + 87614^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021100221 - 2¹⁰ = 11021099197 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 (11021100241) 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, 324149990 + ... + 324150023.

It is an arithmetic number, because the mean of its divisors is an integer number (2917350063).

Almost surely, 2^11021100221 is an apocalyptic number.

It is an amenable number.

11021100221 is a deficient number, since it is larger than the sum of its proper divisors (648300031).

11021100221 is an equidigital number, since it uses as much as digits as its factorization.

11021100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648300030.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11021100221 its reverse (12200112011), we get a palindrome (23221212232).

The spelling of 11021100221 in words is "eleven billion, twenty-one million, one hundred thousand, two hundred twenty-one".