12221222009 has 4 divisors (see below), whose sum is σ = 12864444240. Its totient is φ = 11577999780.

The previous prime is 12221221981. The next prime is 12221222011. The reversal of 12221222009 is 90022212221.

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 12221222009 - 2²⁴ = 12204444793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221222609) 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, 321611087 + ... + 321611124.

It is an arithmetic number, because the mean of its divisors is an integer number (3216111060).

Almost surely, 2^12221222009 is an apocalyptic number.

12221222009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12221222009 is a deficient number, since it is larger than the sum of its proper divisors (643222231).

12221222009 is an equidigital number, since it uses as much as digits as its factorization.

12221222009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643222230.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 12221222009 in words is "twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, nine".