12002020021987 has 4 divisors (see below), whose sum is σ = 12002164323856. Its totient is φ = 12001875720120.

The previous prime is 12002020021939. The next prime is 12002020021993. The reversal of 12002020021987 is 78912002020021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12002020021987 - 2²³ = 12002011633379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12002020028987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72026103 + ... + 72192544.

It is an arithmetic number, because the mean of its divisors is an integer number (3000541080964).

Almost surely, 2^{12002020021987} is an apocalyptic number.

12002020021987 is a deficient number, since it is larger than the sum of its proper divisors (144301869).

12002020021987 is an equidigital number, since it uses as much as digits as its factorization.

12002020021987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144301868.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 12002020021987 in words is "twelve trillion, two billion, twenty million, twenty-one thousand, nine hundred eighty-seven".