12220112221 has 4 divisors (see below), whose sum is σ = 12751421472. Its totient is φ = 11688802972.

The previous prime is 12220112209. The next prime is 12220112269. The reversal of 12220112221 is 12221102221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12220112221 - 2¹¹ = 12220110173 is a prime.

It is a super-2 number, since 2×12220112221² (a number of 21 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 = 12220112195 and 12220112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220112291) 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, 265654591 + ... + 265654636.

It is an arithmetic number, because the mean of its divisors is an integer number (3187855368).

Almost surely, 2^12220112221 is an apocalyptic number.

It is an amenable number.

12220112221 is a deficient number, since it is larger than the sum of its proper divisors (531309251).

12220112221 is an equidigital number, since it uses as much as digits as its factorization.

12220112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531309250.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12220112221 its reverse (12221102221), we get a palindrome (24441214442).

The spelling of 12220112221 in words is "twelve billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".