12012211008 has 224 divisors, whose sum is σ = 42483430400. Its totient is φ = 3251363328.

The previous prime is 12012210971. The next prime is 12012211009. The reversal of 12012211008 is 80011221021.

It is a tau number, because it is divible by the number of its divisors (224).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012211009) 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 31 ways as a sum of consecutive naturals, for example, 203691 + ... + 255957.

Almost surely, 2^12012211008 is an apocalyptic number.

12012211008 is a gapful number since it is divisible by the number (18) 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 12012211008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21241715200).

12012211008 is an abundant number, since it is smaller than the sum of its proper divisors (30471219392).

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

12012211008 is a wasteful number, since it uses less digits than its factorization.

12012211008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52314 (or 52298 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12012211008 its reverse (80011221021), we get a palindrome (92023432029).

The spelling of 12012211008 in words is "twelve billion, twelve million, two hundred eleven thousand, eight".