2021870 has 8 divisors (see below), whose sum is σ = 3639384. Its totient is φ = 808744.

The previous prime is 2021863. The next prime is 2021879. The reversal of 2021870 is 781202.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101084 + ... + 101103.

It is an arithmetic number, because the mean of its divisors is an integer number (454923).

2^2021870 is an apocalyptic number.

2021870 is a deficient number, since it is larger than the sum of its proper divisors (1617514).

2021870 is a wasteful number, since it uses less digits than its factorization.

2021870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202194.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 2021870 is about 1421.9247518768. The cubic root of 2021870 is about 126.4496823735.

The spelling of 2021870 in words is "two million, twenty-one thousand, eight hundred seventy".