12121222409 has 4 divisors (see below), whose sum is σ = 12148218900. Its totient is φ = 12094225920.

The previous prime is 12121222369. The next prime is 12121222417. The reversal of 12121222409 is 90422212121.

12121222409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4086789184 + 8034433225 = 63928^2 + 89635^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121222409 - 2⁸ = 12121222153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121222469) 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, 13497572 + ... + 13498469.

It is an arithmetic number, because the mean of its divisors is an integer number (3037054725).

Almost surely, 2^12121222409 is an apocalyptic number.

It is an amenable number.

12121222409 is a deficient number, since it is larger than the sum of its proper divisors (26996491).

12121222409 is an equidigital number, since it uses as much as digits as its factorization.

12121222409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26996490.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 12121222409 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, four hundred nine".