2021040 has 120 divisors (see below), whose sum is σ = 7776288. Its totient is φ = 460800.

The previous prime is 2021029. The next prime is 2021053. The reversal of 2021040 is 401202.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4840 + ... + 5240.

2^2021040 is an apocalyptic number.

2021040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3888144).

2021040 is an abundant number, since it is smaller than the sum of its proper divisors (5755248).

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

2021040 is a wasteful number, since it uses less digits than its factorization.

2021040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2021040 is about 1421.6328639983. The cubic root of 2021040 is about 126.4323770075.

Adding to 2021040 its reverse (401202), we get a palindrome (2422242).

The spelling of 2021040 in words is "two million, twenty-one thousand, forty".