2021187 has 16 divisors (see below), whose sum is σ = 3111680. Its totient is φ = 1143072.

The previous prime is 2021183. The next prime is 2021191. The reversal of 2021187 is 7811202.

It is an interprime number because it is at equal distance from previous prime (2021183) and next prime (2021191).

It is not a de Polignac number, because 2021187 - 2² = 2021183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021183) 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 15 ways as a sum of consecutive naturals, for example, 1848 + ... + 2730.

It is an arithmetic number, because the mean of its divisors is an integer number (194480).

2^2021187 is an apocalyptic number.

2021187 is a deficient number, since it is larger than the sum of its proper divisors (1090493).

2021187 is a wasteful number, since it uses less digits than its factorization.

2021187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 2021187 is about 1421.6845641703. The cubic root of 2021187 is about 126.4354422790.

Adding to 2021187 its reverse (7811202), we get a palindrome (9832389).

The spelling of 2021187 in words is "two million, twenty-one thousand, one hundred eighty-seven".