2020001021987 has 4 divisors (see below), whose sum is σ = 2175385716000. Its totient is φ = 1864616327976.

The previous prime is 2020001021977. The next prime is 2020001021999. The reversal of 2020001021987 is 7891201000202.

It is a happy number.

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 2020001021987 - 2¹² = 2020001017891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2020001021977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77692346987 + ... + 77692347012.

It is an arithmetic number, because the mean of its divisors is an integer number (543846429000).

Almost surely, 2^{2020001021987} is an apocalyptic number.

2020001021987 is a deficient number, since it is larger than the sum of its proper divisors (155384694013).

2020001021987 is a wasteful number, since it uses less digits than its factorization.

2020001021987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155384694012.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 2020001021987 in words is "two trillion, twenty billion, one million, twenty-one thousand, nine hundred eighty-seven".