22111120212221 has 4 divisors (see below), whose sum is σ = 22111135811100. Its totient is φ = 22111104613344.

The previous prime is 22111120212187. The next prime is 22111120212257. The reversal of 22111120212221 is 12221202111122.

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 14003604295321 + 8107515916900 = 3742139^2 + 2847370^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111120212221 - 2¹⁰ = 22111120211197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22111120212193 and 22111120212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111120212271) 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, 5434106 + ... + 8587883.

It is an arithmetic number, because the mean of its divisors is an integer number (5527783952775).

Almost surely, 2^{22111120212221} is an apocalyptic number.

It is an amenable number.

22111120212221 is a deficient number, since it is larger than the sum of its proper divisors (15598879).

22111120212221 is a wasteful number, since it uses less digits than its factorization.

22111120212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15598878.

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

Adding to 22111120212221 its reverse (12221202111122), we get a palindrome (34332322323343).

The spelling of 22111120212221 in words is "twenty-two trillion, one hundred eleven billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".