12021235660 has 288 divisors, whose sum is σ = 31954728960. Its totient is φ = 3777725952.

The previous prime is 12021235559. The next prime is 12021235661. The reversal of 12021235660 is 6653212021.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (12021235661) 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 95 ways as a sum of consecutive naturals, for example, 76568302 + ... + 76568458.

It is an arithmetic number, because the mean of its divisors is an integer number (110953920).

Almost surely, 2^12021235660 is an apocalyptic number.

12021235660 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 12021235660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15977364480).

12021235660 is an abundant number, since it is smaller than the sum of its proper divisors (19933493300).

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

12021235660 is a wasteful number, since it uses less digits than its factorization.

12021235660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 12021235660 its reverse (6653212021), we get a palindrome (18674447681).

The spelling of 12021235660 in words is "twelve billion, twenty-one million, two hundred thirty-five thousand, six hundred sixty".