2021810 has 32 divisors (see below), whose sum is σ = 4406400. Its totient is φ = 652032.

The previous prime is 2021807. The next prime is 2021837. The reversal of 2021810 is 181202.

It is a super-2 number, since 2×2021810² = 8175431352200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is an unprimeable number.

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, 341 + ... + 2039.

It is an arithmetic number, because the mean of its divisors is an integer number (137700).

2^2021810 is an apocalyptic number.

2021810 is an abundant number, since it is smaller than the sum of its proper divisors (2384590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021810 is a wasteful number, since it uses less digits than its factorization.

2021810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2021810 is about 1421.9036535574. The cubic root of 2021810 is about 126.4484315420.

The spelling of 2021810 in words is "two million, twenty-one thousand, eight hundred ten".