2021387 has 8 divisors (see below), whose sum is σ = 2141040. Its totient is φ = 1905120.

The previous prime is 2021381. The next prime is 2021431. The reversal of 2021387 is 7831202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (267630).

2^2021387 is an apocalyptic number.

2021387 is a deficient number, since it is larger than the sum of its proper divisors (119653).

2021387 is a wasteful number, since it uses less digits than its factorization.

2021387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2021387 is about 1421.7549015214. The cubic root of 2021387 is about 126.4396124777.

Adding to 2021387 its reverse (7831202), we get a palindrome (9852589).

The spelling of 2021387 in words is "two million, twenty-one thousand, three hundred eighty-seven".