2021587 has 4 divisors (see below), whose sum is σ = 2070936. Its totient is φ = 1972240.

The previous prime is 2021573. The next prime is 2021597. The reversal of 2021587 is 7851202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021587 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (2021507) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 24613 + ... + 24694.

It is an arithmetic number, because the mean of its divisors is an integer number (517734).

2^2021587 is an apocalyptic number.

2021587 is a deficient number, since it is larger than the sum of its proper divisors (49349).

2021587 is an equidigital number, since it uses as much as digits as its factorization.

2021587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49348.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2021587 is about 1421.8252353929. The cubic root of 2021587 is about 126.4437824014.

Adding to 2021587 its reverse (7851202), we get a palindrome (9872789).

It can be divided in two parts, 20215 and 87, that added together give a palindrome (20302).

The spelling of 2021587 in words is "two million, twenty-one thousand, five hundred eighty-seven".