11001221221201 has 4 divisors (see below), whose sum is σ = 11019526082404. Its totient is φ = 10982916360000.

The previous prime is 11001221221189. The next prime is 11001221221219. The reversal of 11001221221201 is 10212212210011.

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 5350783206976 + 5650438014225 = 2313176^2 + 2377065^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001221221201 - 2¹⁷ = 11001221090129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11001221225201) 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, 9152429700 + ... + 9152430901.

It is an arithmetic number, because the mean of its divisors is an integer number (2754881520601).

Almost surely, 2^{11001221221201} is an apocalyptic number.

It is an amenable number.

11001221221201 is a deficient number, since it is larger than the sum of its proper divisors (18304861203).

11001221221201 is an equidigital number, since it uses as much as digits as its factorization.

11001221221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18304861202.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11001221221201 its reverse (10212212210011), we get a palindrome (21213433431212).

The spelling of 11001221221201 in words is "eleven trillion, one billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred one".