22112220220121 has 4 divisors (see below), whose sum is σ = 22112298635700. Its totient is φ = 22112141804544.

The previous prime is 22112220220081. The next prime is 22112220220141. The reversal of 22112220220121 is 12102202221122.

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 21649813420096 + 462406800025 = 4652936^2 + 680005^2 .

It is a cyclic number.

It is not a de Polignac number, because 22112220220121 - 2³⁰ = 22111146478297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22112220220093 and 22112220220102.

It is not an unprimeable number, because it can be changed into a prime (22112220220141) 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, 38783276 + ... + 39349293.

It is an arithmetic number, because the mean of its divisors is an integer number (5528074658925).

Almost surely, 2^{22112220220121} is an apocalyptic number.

It is an amenable number.

22112220220121 is a deficient number, since it is larger than the sum of its proper divisors (78415579).

22112220220121 is an equidigital number, since it uses as much as digits as its factorization.

22112220220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78415578.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22112220220121 its reverse (12102202221122), we get a palindrome (34214422441243).

The spelling of 22112220220121 in words is "twenty-two trillion, one hundred twelve billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-one".