11011220021221 has 16 divisors (see below), whose sum is σ = 12898390821120. Its totient is φ = 9202841435520.

The previous prime is 11011220021201. The next prime is 11011220021237. The reversal of 11011220021221 is 12212002211011.

It is a cyclic number.

It is not a de Polignac number, because 11011220021221 - 2¹⁹ = 11011219496933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11011220021195 and 11011220021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011220021201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10209481 + ... + 11236366.

It is an arithmetic number, because the mean of its divisors is an integer number (806149426320).

Almost surely, 2^{11011220021221} is an apocalyptic number.

It is an amenable number.

11011220021221 is a deficient number, since it is larger than the sum of its proper divisors (1887170799899).

11011220021221 is a wasteful number, since it uses less digits than its factorization.

11011220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21447684.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11011220021221 its reverse (12212002211011), we get a palindrome (23223222232232).

The spelling of 11011220021221 in words is "eleven trillion, eleven billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".