12021347808 has 96 divisors (see below), whose sum is σ = 36586771200. Its totient is φ = 3832887168.

The previous prime is 12021347801. The next prime is 12021347857. The reversal of 12021347808 is 80874312021.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021347801) 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, 282598 + ... + 322341.

It is an arithmetic number, because the mean of its divisors is an integer number (381112200).

Almost surely, 2^12021347808 is an apocalyptic number.

12021347808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12021347808 is an abundant number, since it is smaller than the sum of its proper divisors (24565423392).

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

12021347808 is a wasteful number, since it uses less digits than its factorization.

12021347808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604981 (or 604967 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

Adding to 12021347808 its reverse (80874312021), we get a palindrome (92895659829).

The spelling of 12021347808 in words is "twelve billion, twenty-one million, three hundred forty-seven thousand, eight hundred eight".