12012885109 has 4 divisors (see below), whose sum is σ = 12645142240. Its totient is φ = 11380627980.

The previous prime is 12012885107. The next prime is 12012885121. The reversal of 12012885109 is 90158821021.

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 not a de Polignac number, because 12012885109 - 2¹ = 12012885107 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 (12012885107) 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, 316128537 + ... + 316128574.

It is an arithmetic number, because the mean of its divisors is an integer number (3161285560).

Almost surely, 2^12012885109 is an apocalyptic number.

12012885109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12012885109 is a deficient number, since it is larger than the sum of its proper divisors (632257131).

12012885109 is an equidigital number, since it uses as much as digits as its factorization.

12012885109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632257130.

The product of its (nonzero) digits is 11520, while the sum is 37.

The spelling of 12012885109 in words is "twelve billion, twelve million, eight hundred eighty-five thousand, one hundred nine".