11011211202221 has 16 divisors (see below), whose sum is σ = 11686126421376. Its totient is φ = 10339324417536.

The previous prime is 11011211202209. The next prime is 11011211202227. The reversal of 11011211202221 is 12220211211011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011211202221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11011211202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011211202227) 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, 55737200 + ... + 55934406.

It is an arithmetic number, because the mean of its divisors is an integer number (730382901336).

Almost surely, 2^{11011211202221} is an apocalyptic number.

It is an amenable number.

11011211202221 is a deficient number, since it is larger than the sum of its proper divisors (674915219155).

11011211202221 is a wasteful number, since it uses less digits than its factorization.

11011211202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204868.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11011211202221 its reverse (12220211211011), we get a palindrome (23231422413232).

The spelling of 11011211202221 in words is "eleven trillion, eleven billion, two hundred eleven million, two hundred two thousand, two hundred twenty-one".