12013434432 has 112 divisors (see below), whose sum is σ = 35357287680. Its totient is φ = 3999942144.

The previous prime is 12013434431. The next prime is 12013434449. The reversal of 12013434432 is 23443431021.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12013434396 and 12013434405.

It is not an unprimeable number, because it can be changed into a prime (12013434431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1747033 + ... + 1753895.

Almost surely, 2^12013434432 is an apocalyptic number.

12013434432 is a gapful number since it is divisible by the number (12) 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 12013434432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17678643840).

12013434432 is an abundant number, since it is smaller than the sum of its proper divisors (23343853248).

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

12013434432 is a wasteful number, since it uses less digits than its factorization.

12013434432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7897 (or 7881 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 12013434432 its reverse (23443431021), we get a palindrome (35456865453).

The spelling of 12013434432 in words is "twelve billion, thirteen million, four hundred thirty-four thousand, four hundred thirty-two".