11022121022221 has 4 divisors (see below), whose sum is σ = 11202811530844. Its totient is φ = 10841430513600.

The previous prime is 11022121022191. The next prime is 11022121022239. The reversal of 11022121022221 is 12222012122011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1271402829225 + 9750718192996 = 1127565^2 + 3122614^2 .

It is a cyclic number.

It is not a de Polignac number, because 11022121022221 - 2⁵ = 11022121022189 is a prime.

It is a super-2 number, since 2×11022121022221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11022121022291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90345254220 + ... + 90345254341.

It is an arithmetic number, because the mean of its divisors is an integer number (2800702882711).

Almost surely, 2^{11022121022221} is an apocalyptic number.

It is an amenable number.

11022121022221 is a deficient number, since it is larger than the sum of its proper divisors (180690508623).

11022121022221 is an equidigital number, since it uses as much as digits as its factorization.

11022121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180690508622.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 11022121022221 its reverse (12222012122011), we get a palindrome (23244133144232).

The spelling of 11022121022221 in words is "eleven trillion, twenty-two billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".