11211222110221 has 16 divisors (see below), whose sum is σ = 13352488358400. Its totient is φ = 9405158960400.

The previous prime is 11211222110219. The next prime is 11211222110273. The reversal of 11211222110221 is 12201122211211.

It is a happy number.

It is not a de Polignac number, because 11211222110221 - 2¹ = 11211222110219 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 (11211222110021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347704930 + ... + 347737171.

It is an arithmetic number, because the mean of its divisors is an integer number (834530522400).

Almost surely, 2^{11211222110221} is an apocalyptic number.

It is an amenable number.

11211222110221 is a deficient number, since it is larger than the sum of its proper divisors (2141266248179).

11211222110221 is an frugal number, since it uses more digits than its factorization.

11211222110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695442169 (or 695442155 counting only the distinct ones).

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

Adding to 11211222110221 its reverse (12201122211211), we get a palindrome (23412344321432).

The spelling of 11211222110221 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-two million, one hundred ten thousand, two hundred twenty-one".