12091209106 has 4 divisors (see below), whose sum is σ = 18136813662. Its totient is φ = 6045604552.

The previous prime is 12091209079. The next prime is 12091209107. The reversal of 12091209106 is 60190219021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9859497025 + 2231712081 = 99295^2 + 47241^2 .

It is not an unprimeable number, because it can be changed into a prime (12091209107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3022802275 + ... + 3022802278.

Almost surely, 2^12091209106 is an apocalyptic number.

12091209106 is a deficient number, since it is larger than the sum of its proper divisors (6045604556).

12091209106 is an equidigital number, since it uses as much as digits as its factorization.

12091209106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6045604555.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 12091209106 in words is "twelve billion, ninety-one million, two hundred nine thousand, one hundred six".