12012340340 has 144 divisors (see below), whose sum is σ = 34126974336. Its totient is φ = 3456034560.

The previous prime is 12012340337. The next prime is 12012340349. The reversal of 12012340340 is 4304321021.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012340349) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192947 + ... + 247493.

Almost surely, 2^12012340340 is an apocalyptic number.

12012340340 is a gapful number since it is divisible by the number (10) 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 12012340340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17063487168).

12012340340 is an abundant number, since it is smaller than the sum of its proper divisors (22114633996).

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

12012340340 is a wasteful number, since it uses less digits than its factorization.

12012340340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54598 (or 54585 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 12012340340 its reverse (4304321021), we get a palindrome (16316661361).

The spelling of 12012340340 in words is "twelve billion, twelve million, three hundred forty thousand, three hundred forty".