12120309989 has 4 divisors (see below), whose sum is σ = 12128495340. Its totient is φ = 12112124640.

The previous prime is 12120309947. The next prime is 12120310003. The reversal of 12120309989 is 98990302121.

It is a happy number.

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 7953607489 + 4166702500 = 89183^2 + 64550^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120309989 - 2¹² = 12120305893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120309889) 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, 4090454 + ... + 4093415.

It is an arithmetic number, because the mean of its divisors is an integer number (3032123835).

Almost surely, 2^12120309989 is an apocalyptic number.

It is an amenable number.

12120309989 is a deficient number, since it is larger than the sum of its proper divisors (8185351).

12120309989 is an equidigital number, since it uses as much as digits as its factorization.

12120309989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8185350.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 12120309989 in words is "twelve billion, one hundred twenty million, three hundred nine thousand, nine hundred eighty-nine".