11011221211221 has 64 divisors (see below), whose sum is σ = 20753251584000. Its totient is φ = 5720114862000.

The previous prime is 11011221211219. The next prime is 11011221211229. The reversal of 11011221211221 is 12211212211011.

It is a happy number.

11011221211221 is a `hidden beast` number, since 1 + 1 + 0 + 11 + 221 + 211 + 221 = 666.

It is not a de Polignac number, because 11011221211221 - 2¹ = 11011221211219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11011221211194 and 11011221211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011221211229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53943055 + ... + 54146796.

It is an arithmetic number, because the mean of its divisors is an integer number (324269556000).

Almost surely, 2^{11011221211221} is an apocalyptic number.

11011221211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11011221211221 is a deficient number, since it is larger than the sum of its proper divisors (9742030372779).

11011221211221 is a wasteful number, since it uses less digits than its factorization.

11011221211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108089892 (or 108089872 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11011221211221 its reverse (12211212211011), we get a palindrome (23222433422232).

The spelling of 11011221211221 in words is "eleven trillion, eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".