11001000221 has 2 divisors, whose sum is σ = 11001000222. Its totient is φ = 11001000220.

The previous prime is 11001000217. The next prime is 11001000253. The reversal of 11001000221 is 12200010011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10047055225 + 953944996 = 100235^2 + 30886^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001000221 - 2² = 11001000217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11001000199 and 11001000208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11001000421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500500110 + 5500500111.

It is an arithmetic number, because the mean of its divisors is an integer number (5500500111).

Almost surely, 2^11001000221 is an apocalyptic number.

It is an amenable number.

11001000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001000221 is an equidigital number, since it uses as much as digits as its factorization.

11001000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 11001000221 its reverse (12200010011), we get a palindrome (23201010232).

The spelling of 11001000221 in words is "eleven billion, one million, two hundred twenty-one", and thus it is an aban number.