11321100221 has 4 divisors (see below), whose sum is σ = 11325233244. Its totient is φ = 11316967200.

The previous prime is 11321100209. The next prime is 11321100247. The reversal of 11321100221 is 12200112311.

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 4442222500 + 6878877721 = 66650^2 + 82939^2 .

It is a cyclic number.

It is not a de Polignac number, because 11321100221 - 2²² = 11316905917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11321100196 and 11321100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11321106221) 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, 2062400 + ... + 2067881.

It is an arithmetic number, because the mean of its divisors is an integer number (2831308311).

Almost surely, 2^11321100221 is an apocalyptic number.

It is an amenable number.

11321100221 is a deficient number, since it is larger than the sum of its proper divisors (4133023).

11321100221 is an equidigital number, since it uses as much as digits as its factorization.

11321100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133022.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 11321100221 its reverse (12200112311), we get a palindrome (23521212532).

The spelling of 11321100221 in words is "eleven billion, three hundred twenty-one million, one hundred thousand, two hundred twenty-one".