12109309536 has 96 divisors (see below), whose sum is σ = 32159731968. Its totient is φ = 3989260800.

The previous prime is 12109309481. The next prime is 12109309543. The reversal of 12109309536 is 63590390121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 12109309494 and 12109309503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6930615 + ... + 6932361.

It is an arithmetic number, because the mean of its divisors is an integer number (334997208).

Almost surely, 2^12109309536 is an apocalyptic number.

12109309536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12109309536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16079865984).

12109309536 is an abundant number, since it is smaller than the sum of its proper divisors (20050422432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12109309536 is a wasteful number, since it uses less digits than its factorization.

12109309536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564 (or 2556 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 39.

Adding to 12109309536 its reverse (63590390121), we get a palindrome (75699699657).

The spelling of 12109309536 in words is "twelve billion, one hundred nine million, three hundred nine thousand, five hundred thirty-six".