12201122222221 has 4 divisors (see below), whose sum is σ = 12201537411100. Its totient is φ = 12200707033344.

The previous prime is 12201122222213. The next prime is 12201122222293. The reversal of 12201122222221 is 12222222110221.

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 7269440516100 + 4931681706121 = 2696190^2 + 2220739^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201122222221 - 2³ = 12201122222213 is a prime.

It is a super-2 number, since 2×12201122222221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12201122222192 and 12201122222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201122262221) 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, 207550356 + ... + 207609133.

It is an arithmetic number, because the mean of its divisors is an integer number (3050384352775).

Almost surely, 2^{12201122222221} is an apocalyptic number.

It is an amenable number.

12201122222221 is a deficient number, since it is larger than the sum of its proper divisors (415188879).

12201122222221 is an equidigital number, since it uses as much as digits as its factorization.

12201122222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415188878.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 12201122222221 its reverse (12222222110221), we get a palindrome (24423344332442).

The spelling of 12201122222221 in words is "twelve trillion, two hundred one billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".