12021040512 has 192 divisors, whose sum is σ = 37454726400. Its totient is φ = 3678732288.

The previous prime is 12021040501. The next prime is 12021040543. The reversal of 12021040512 is 21504012021.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×12021040512² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2888289 + ... + 2892447.

It is an arithmetic number, because the mean of its divisors is an integer number (195076700).

Almost surely, 2^12021040512 is an apocalyptic number.

12021040512 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 12021040512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18727363200).

12021040512 is an abundant number, since it is smaller than the sum of its proper divisors (25433685888).

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

12021040512 is a wasteful number, since it uses less digits than its factorization.

12021040512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4385 (or 4370 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 12021040512 its reverse (21504012021), we get a palindrome (33525052533).

The spelling of 12021040512 in words is "twelve billion, twenty-one million, forty thousand, five hundred twelve".