12011243420 has 24 divisors (see below), whose sum is σ = 27516667248. Its totient is φ = 4367724800.

The previous prime is 12011243417. The next prime is 12011243429. The reversal of 12011243420 is 2434211021.

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 = 12011243392 and 12011243401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011243429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27298061 + ... + 27298500.

It is an arithmetic number, because the mean of its divisors is an integer number (1146527802).

Almost surely, 2^12011243420 is an apocalyptic number.

12011243420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12011243420 is an abundant number, since it is smaller than the sum of its proper divisors (15505423828).

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

12011243420 is a wasteful number, since it uses less digits than its factorization.

12011243420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54596581 (or 54596579 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12011243420 its reverse (2434211021), we get a palindrome (14445454441).

The spelling of 12011243420 in words is "twelve billion, eleven million, two hundred forty-three thousand, four hundred twenty".