12129747084 has 480 divisors, whose sum is σ = 42110509056. Its totient is φ = 2956124160.

The previous prime is 12129747029. The next prime is 12129747121. The reversal of 12129747084 is 48074792121.

12129747084 is a `hidden beast` number, since 1 + 2 + 12 + 97 + 470 + 84 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 21021804 + ... + 21022380.

Almost surely, 2^12129747084 is an apocalyptic number.

12129747084 is a gapful number since it is divisible by the number (14) 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 12129747084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21055254528).

12129747084 is an abundant number, since it is smaller than the sum of its proper divisors (29980761972).

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

12129747084 is a wasteful number, since it uses less digits than its factorization.

12129747084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 12129747084 in words is "twelve billion, one hundred twenty-nine million, seven hundred forty-seven thousand, eighty-four".