12021144140 has 24 divisors (see below), whose sum is σ = 25247179440. Its totient is φ = 4807928768.

The previous prime is 12021144077. The next prime is 12021144209. The reversal of 12021144140 is 4144112021.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190046 + ... + 245274.

It is an arithmetic number, because the mean of its divisors is an integer number (1051965810).

Almost surely, 2^12021144140 is an apocalyptic number.

12021144140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021144140 is an abundant number, since it is smaller than the sum of its proper divisors (13226035300).

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

12021144140 is a wasteful number, since it uses less digits than its factorization.

12021144140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66121 (or 66119 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12021144140 its reverse (4144112021), we get a palindrome (16165256161).

The spelling of 12021144140 in words is "twelve billion, twenty-one million, one hundred forty-four thousand, one hundred forty".