11001100221 has 12 divisors (see below), whose sum is σ = 16319950972. Its totient is φ = 7135848576.

The previous prime is 11001100217. The next prime is 11001100241. The reversal of 11001100221 is 12200110011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9854532900 + 1146567321 = 99270^2 + 33861^2 .

It is not a de Polignac number, because 11001100221 - 2² = 11001100217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001100241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16517836 + ... + 16518501.

Almost surely, 2^11001100221 is an apocalyptic number.

It is an amenable number.

11001100221 is a deficient number, since it is larger than the sum of its proper divisors (5318850751).

11001100221 is a wasteful number, since it uses less digits than its factorization.

11001100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33036380 (or 33036377 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11001100221 its reverse (12200110011), we get a palindrome (23201210232).

The spelling of 11001100221 in words is "eleven billion, one million, one hundred thousand, two hundred twenty-one".