11001012221 has 8 divisors (see below), whose sum is σ = 11382940920. Its totient is φ = 10619255808.

The previous prime is 11001012203. The next prime is 11001012223. The reversal of 11001012221 is 12221010011.

It can be written as a sum of positive squares in 4 ways, for example, as 148996 + 11000863225 = 386^2 + 104885^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11001012221 - 2⁶ = 11001012157 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 (11001012223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94325 + ... + 175781.

It is an arithmetic number, because the mean of its divisors is an integer number (1422867615).

Almost surely, 2^11001012221 is an apocalyptic number.

It is an amenable number.

11001012221 is a deficient number, since it is larger than the sum of its proper divisors (381928699).

11001012221 is an equidigital number, since it uses as much as digits as its factorization.

11001012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86143.

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

Adding to 11001012221 its reverse (12221010011), we get a palindrome (23222022232).

The spelling of 11001012221 in words is "eleven billion, one million, twelve thousand, two hundred twenty-one".