12109400120 has 32 divisors (see below), whose sum is σ = 27398379600. Its totient is φ = 4816697088.

The previous prime is 12109400113. The next prime is 12109400137. The reversal of 12109400120 is 2100490121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12109400092 and 12109400101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 838469 + ... + 852788.

Almost surely, 2^12109400120 is an apocalyptic number.

12109400120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12109400120 is an abundant number, since it is smaller than the sum of its proper divisors (15288979480).

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

12109400120 is a wasteful number, since it uses less digits than its factorization.

12109400120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691447 (or 1691443 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 12109400120 its reverse (2100490121), we get a palindrome (14209890241).

The spelling of 12109400120 in words is "twelve billion, one hundred nine million, four hundred thousand, one hundred twenty".