2021868 has 48 divisors (see below), whose sum is σ = 5323360. Its totient is φ = 663552.

The previous prime is 2021863. The next prime is 2021879. The reversal of 2021868 is 8681202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2021863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10380 + ... + 10572.

2^2021868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2661680).

2021868 is an abundant number, since it is smaller than the sum of its proper divisors (3301492).

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

2021868 is a wasteful number, since it uses less digits than its factorization.

2021868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 2021868 is about 1421.9240486046. The cubic root of 2021868 is about 126.4496406795.

The spelling of 2021868 in words is "two million, twenty-one thousand, eight hundred sixty-eight".