2021240 has 64 divisors (see below), whose sum is σ = 5140800. Its totient is φ = 713856.

The previous prime is 2021237. The next prime is 2021251. The reversal of 2021240 is 421202.

It is a super-2 number, since 2×2021240² = 8170822275200, which contains 22 as substring.

It is a house number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87869 + ... + 87891.

It is an arithmetic number, because the mean of its divisors is an integer number (80325).

2^2021240 is an apocalyptic number.

2021240 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 2021240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2570400).

2021240 is an abundant number, since it is smaller than the sum of its proper divisors (3119560).

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

2021240 is a wasteful number, since it uses less digits than its factorization.

2021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2021240 is about 1421.7032039072. The cubic root of 2021240 is about 126.4365474085.

Adding to 2021240 its reverse (421202), we get a palindrome (2442442).

The spelling of 2021240 in words is "two million, twenty-one thousand, two hundred forty".