12022221 has 4 divisors (see below), whose sum is σ = 16029632. Its totient is φ = 8014812.

The previous prime is 12022181. The next prime is 12022223. The reversal of 12022221 is 12222021.

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 not a de Polignac number, because 12022221 - 2⁷ = 12022093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12022197 and 12022206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12022223) 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, 2003701 + ... + 2003706.

It is an arithmetic number, because the mean of its divisors is an integer number (4007408).

Almost surely, 2^12022221 is an apocalyptic number.

It is an amenable number.

12022221 is a deficient number, since it is larger than the sum of its proper divisors (4007411).

12022221 is an equidigital number, since it uses as much as digits as its factorization.

12022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 12022221 is about 3467.3074568028. The cubic root of 12022221 is about 229.0840763469.

Adding to 12022221 its reverse (12222021), we get a palindrome (24244242).

The spelling of 12022221 in words is "twelve million, twenty-two thousand, two hundred twenty-one".