121222009 has 4 divisors (see below), whose sum is σ = 121569700. Its totient is φ = 120874320.

The previous prime is 121222007. The next prime is 121222037. The reversal of 121222009 is 900222121.

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 97456384 + 23765625 = 9872^2 + 4875^2 .

It is a cyclic number.

It is not a de Polignac number, because 121222009 - 2¹ = 121222007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121222007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173322 + ... + 174019.

It is an arithmetic number, because the mean of its divisors is an integer number (30392425).

Almost surely, 2^121222009 is an apocalyptic number.

It is an amenable number.

121222009 is a deficient number, since it is larger than the sum of its proper divisors (347691).

121222009 is an equidigital number, since it uses as much as digits as its factorization.

121222009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347690.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 121222009 is about 11010.0866935733. The cubic root of 121222009 is about 494.9110597610.

The spelling of 121222009 in words is "one hundred twenty-one million, two hundred twenty-two thousand, nine".