20421800588387 has 16 divisors (see below), whose sum is σ = 22293825613920. Its totient is φ = 18552360691200.

The previous prime is 20421800588351. The next prime is 20421800588393. The reversal of 20421800588387 is 78388500812402.

It is a cyclic number.

It is not a de Polignac number, because 20421800588387 - 2¹² = 20421800584291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421800588087) 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, 213522437 + ... + 213618057.

It is an arithmetic number, because the mean of its divisors is an integer number (1393364100870).

Almost surely, 2^{20421800588387} is an apocalyptic number.

20421800588387 is a deficient number, since it is larger than the sum of its proper divisors (1872025025533).

20421800588387 is a wasteful number, since it uses less digits than its factorization.

20421800588387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108934.

The product of its (nonzero) digits is 6881280, while the sum is 56.

The spelling of 20421800588387 in words is "twenty trillion, four hundred twenty-one billion, eight hundred million, five hundred eighty-eight thousand, three hundred eighty-seven".