11011101011221 has 6 divisors (see below), whose sum is σ = 11510659469750. Its totient is φ = 10532357488488.

The previous prime is 11011101011219. The next prime is 11011101011227. The reversal of 11011101011221 is 12211010111011.

It can be written as a sum of positive squares in only one way, i.e., 5663495636100 + 5347605375121 = 2379810^2 + 2312489^2 .

It is not a de Polignac number, because 11011101011221 - 2¹ = 11011101011219 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 (11011101011227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10407467346 + ... + 10407468403.

Almost surely, 2^{11011101011221} is an apocalyptic number.

It is an amenable number.

11011101011221 is a deficient number, since it is larger than the sum of its proper divisors (499558458529).

11011101011221 is an equidigital number, since it uses as much as digits as its factorization.

11011101011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20814935795 (or 20814935772 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11011101011221 its reverse (12211010111011), we get a palindrome (23222111122232).

The spelling of 11011101011221 in words is "eleven trillion, eleven billion, one hundred one million, eleven thousand, two hundred twenty-one".