11122121022221 has 64 divisors (see below), whose sum is σ = 13219572252672. Its totient is φ = 9252012000000.

The previous prime is 11122121022197. The next prime is 11122121022247. The reversal of 11122121022221 is 12222012122111.

It is not a de Polignac number, because 11122121022221 - 2⁶ = 11122121022157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11122121022193 and 11122121022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122121022251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 512505671 + ... + 512527371.

It is an arithmetic number, because the mean of its divisors is an integer number (206555816448).

Almost surely, 2^{11122121022221} is an apocalyptic number.

11122121022221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11122121022221 is a deficient number, since it is larger than the sum of its proper divisors (2097451230451).

11122121022221 is a wasteful number, since it uses less digits than its factorization.

11122121022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22514.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11122121022221 its reverse (12222012122111), we get a palindrome (23344133144332).

The spelling of 11122121022221 in words is "eleven trillion, one hundred twenty-two billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".