11211221122201 has 8 divisors (see below), whose sum is σ = 11365437961224. Its totient is φ = 11057021539200.

The previous prime is 11211221122151. The next prime is 11211221122207. The reversal of 11211221122201 is 10222112211211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2569673120400 + 8641548001801 = 1603020^2 + 2939651^2 .

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 11211221122201 - 2²¹ = 11211219025049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211221122207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3002950 + ... + 5607151.

It is an arithmetic number, because the mean of its divisors is an integer number (1420679745153).

Almost surely, 2^{11211221122201} is an apocalyptic number.

It is an amenable number.

11211221122201 is a deficient number, since it is larger than the sum of its proper divisors (154216839023).

11211221122201 is an equidigital number, since it uses as much as digits as its factorization.

11211221122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8628011.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11211221122201 its reverse (10222112211211), we get a palindrome (21433333333412).

The spelling of 11211221122201 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred one".