11011201021221 has 16 divisors (see below), whose sum is σ = 14874006185280. Its totient is φ = 7244903191680.

The previous prime is 11011201021187. The next prime is 11011201021241. The reversal of 11011201021221 is 12212010211011.

It is a happy number.

It is not a de Polignac number, because 11011201021221 - 2¹¹ = 11011201019173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11011201021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011201021241) 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 15 ways as a sum of consecutive naturals, for example, 37970575 + ... + 38259468.

It is an arithmetic number, because the mean of its divisors is an integer number (929625386580).

Almost surely, 2^{11011201021221} is an apocalyptic number.

It is an amenable number.

11011201021221 is a deficient number, since it is larger than the sum of its proper divisors (3862805164059).

11011201021221 is an equidigital number, since it uses as much as digits as its factorization.

11011201021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76230676.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11011201021221 its reverse (12212010211011), we get a palindrome (23223211232232).

The spelling of 11011201021221 in words is "eleven trillion, eleven billion, two hundred one million, twenty-one thousand, two hundred twenty-one".